The Weather Station That Turned the Backyard Into a Data Source.
Tempest took the familiar home weather station, removed the spinning cups, tipping bucket and exposed moving mechanisms, then connected the whole thing to a forecasting network. The current Tempest '26 goes further with upgraded temperature, humidity and rain sensing, larger solar panels, a redesigned charging system and a replaceable battery. What makes it interesting is not one sensor. It is the idea that your house can become part of the observing system that predicts what happens at your house next.
By Dr. Rob Urban · On ultrasonic wind, haptic rain sensing, lightning detection, solar power, LTO batteries, hyperlocal forecasting, network effects and why personal weather becomes more useful when thousands of personal stations learn together
First, the current-model check
Use Tempest '26, not the original 2020 hardware. It is the current generation and the meaningful upgrade.
The product name remains Tempest Weather Station, but the current hardware is the 2026 generation that WeatherFlow-Tempest introduced in late 2025. The company describes Tempest '26 as the next generation of the same flagship system rather than a separate premium tier.
The new model keeps the architecture that made Tempest distinctive: a single outdoor sensor body, no traditional moving weather mechanisms, solar power, an indoor hub, app access and the Nearcast forecasting system. But it upgrades the parts that determine long-term usefulness. Tempest says the 2026 model uses larger solar panels, a redesigned charging system, a removable and replaceable lithium-titanate battery, improved temperature and humidity sensing, an updated rain sensor, better environmental coating and a slimmer hub.
That is exactly the kind of generational change worth selecting for this series. The original Tempest remains historically important, but Tempest '26 fixes one of the weak points of many sealed smart devices: eventually the battery becomes the life-limiting component. Making it replaceable gives the outdoor hardware a better chance of outlasting its first energy-storage cell.
Weather is global physics experienced locally
The forecast for the airport can be correct and still be wrong for your backyard.
Most people experience weather through a forecast point that was never actually their house. The temperature may come from a government station several miles away. Rainfall can vary dramatically across a neighborhood. Wind at an exposed airport bears little resemblance to wind behind suburban trees and houses. Thunderstorms can dump an inch of rain on one side of town and almost nothing on the other.
This is not a failure of meteorology. It is a scale problem.
Weather models describe the atmosphere over grids. Radar estimates precipitation over areas. official surface networks provide high-quality observations, but no national network can place a professional station in every yard. Local terrain, buildings, vegetation, coastlines and convective storms add variation below the resolution of any one model.
A personal weather station gives the forecast system a local observation. The temperature is not “nearby.” It is outside. The rain did not fall somewhere in the county. It hit the sensor. The wind is the wind at that installation site.
Tempest's most important move was recognizing that the station should not stop at observation. Its data can be fed back into a larger system that improves the forecast returned to the owner.
The anemometer has nothing to spin
Tempest measures wind by timing sound.
Traditional home weather stations often use rotating cups for wind speed and a vane for direction. The principle is intuitive because you can see the wind making the instrument move. Tempest replaces both with an ultrasonic anemometer built into the top of the sensor body.
Pairs of ultrasonic transducers send acoustic pulses across a known distance. With no wind, the transit time is essentially symmetrical in opposite directions. When air moves, sound traveling with the airflow arrives slightly sooner while sound traveling against it takes slightly longer. By comparing those transit times across multiple paths, the station can calculate both wind speed and direction.
The advantage is mechanical simplicity. There are no bearings to wear, no cups to seize, no vane pivot to corrode and no small moving assembly that can accumulate ice, insects or debris. Tempest samples the wind as frequently as every three seconds at full operating power, then reports one-minute averages along with gust and lull values.
Solid-state does not mean invulnerable. Ice, siting, obstruction and contamination can still affect an ultrasonic sensor. But eliminating continuously moving outdoor parts removes one classic maintenance category from the home weather station.
This is a good example of industrial sensing migrating into consumer hardware. Measure a physical process indirectly with timing and computation instead of relying on a visible mechanism.
Rain is measured by impact instead of buckets
The haptic sensor listens to drops striking the station.
Most familiar rain gauges collect water and measure accumulated volume. The classic tipping-bucket design funnels rain into a tiny seesaw mechanism that tips each time a known amount of water has collected. Count the tips and you estimate rainfall.
Tempest uses a radically different method. Its haptic rain sensor detects the mechanical effect of raindrops hitting the top surface. WeatherFlow describes the technology as measuring and counting impacts through a combination of pressure and capacitance. The system then estimates rain onset, intensity, duration and accumulation.
The appeal is again the absence of moving parts. There is no funnel that needs to stay clear and no tiny bucket pivot cycling thousands of times. It can also detect rain onset quickly because it does not have to wait for enough water to physically fill a tipping chamber.
The tradeoff is that impact sensing is an inference. A tipping bucket directly measures collected water volume while a haptic system interprets vibrations caused by drops. Installation vibration, hail, nearby mechanical movement and the size distribution of raindrops can complicate that relationship. WeatherFlow therefore combines sensor behavior with calibration and Nearcast processing rather than pretending every impact is a perfect miniature graduated cylinder.
The 2026 model specifically includes an upgraded haptic rain sensor intended to improve light-rain detection and consistency. That matters because drizzle and gentle rainfall are among the hardest conditions for impact-based sensing.
Tempest replaces a mechanical measuring cup with a signal-processing problem, then uses the network to keep improving the answer.
Know when rain begins
The haptic surface can trigger a rain-start event quickly, useful for alerts and smart-home actions.
Estimate how hard it is raining
Impact behavior is interpreted into qualitative and quantitative rainfall-rate information.
Build the event total
Software integrates the observed rain behavior over time and combines it with calibration logic.
It can hear storms before you can
Lightning detection turns a backyard station into an early-warning instrument.
Tempest includes a lightning sensor and currently advertises strike detection out to about 25 miles. The station reports strike activity and distance through the app, providing a local warning signal before thunder becomes obvious at the house.
Lightning sensors detect the electromagnetic impulse produced by a discharge rather than waiting to see a flash optically. That is useful because line of sight is unreliable. Trees, buildings, terrain and daylight can hide lightning while the electromagnetic signature still travels through the environment.
False positives are possible because motors, electrical equipment and other sources can produce interference. As with rain, the value is not one raw sensor event in isolation. The broader software system can compare timing, station behavior and network observations to determine whether a signal is consistent with an actual storm.
This is where local sensing becomes actionable. A lightning alert can matter to someone mowing a lawn, working on a roof, swimming, coaching outside or managing irrigation equipment. Weather is no longer abstract information displayed on a phone. It becomes a trigger for behavior.
The station's practical value therefore depends less on collecting more atmospheric variables than on shortening the gap between measurement and decision.
There is a lot happening inside one white cylinder
Temperature, humidity, pressure, UV and solar radiation all share the same outdoor platform.
The current Tempest measures temperature, humidity, barometric pressure, wind speed and direction, rainfall behavior, ultraviolet index, solar radiation and lightning. The system also calculates derived values such as dew point, heat index, wind chill, wet-bulb temperature, air density and DeltaT.
Combining that many variables matters because weather is relational. Relative humidity means something different at different temperatures. Heat index combines heat and moisture. Wet-bulb temperature describes the cooling potential of evaporation. DeltaT, the difference between dry-bulb and wet-bulb temperature, is useful in agriculture and spraying because it helps characterize evaporative conditions.
A personal weather station therefore becomes more interesting as an integrated atmospheric picture than as a thermometer with accessories.
Tempest also uses an integrated radiation shield around its temperature and humidity sensing rather than requiring a large separate Stevenson-screen-style enclosure. The 2026 revision upgrades those sensors and adds improved weather protection to the body.
None of that eliminates the importance of siting. A brilliant temperature sensor mounted above a hot roof will faithfully report the microclimate above a hot roof. Measurement quality is always a combination of sensor quality and installation quality.
Outdoor electronics fail when power becomes maintenance
Tempest '26 improves the least glamorous subsystem and may have made the whole product better.
The station is solar powered and uses an onboard lithium-titanate battery. LTO chemistry is unusual in consumer electronics because it gives up energy density in exchange for excellent cycle life, fast charge acceptance and strong low-temperature characteristics.
Those are excellent priorities for a weather station. The battery does not need to make the sensor pocket-size. It needs to accept small solar charges day after day, survive outdoor temperature swings and keep the station alive through cloudy periods. WeatherFlow says a fully charged Tempest can typically operate for around two weeks without additional solar input, with automatic power-saving modes available as battery voltage falls.
The important 2026 change is serviceability. Earlier Tempest units used an internal battery designed to last a long time but not intended for ordinary field replacement. Tempest '26 redesigns the charging system, enlarges the solar collection area and makes the LTO battery removable and replaceable.
That is exactly the kind of change I wish more connected products made. Electronics can remain functional long after a rechargeable cell has degraded. A replaceable battery prevents an otherwise healthy sensor suite from becoming electronic waste because one electrochemical component aged first.
WeatherFlow also says the current generation uses improved coating and more environmentally restrained packaging. Those changes are less dramatic than a new sensor, but longevity is often built from boring decisions.
The station is only half the product
Nearcast turns each Tempest into both a consumer of weather intelligence and a contributor to it.
WeatherFlow-Tempest says its Nearcast system combines data from more than 85,000 Tempest stations, roughly 600 industrial ProNet stations and more than 100,000 additional curated surface data values, along with radar, satellite, public-domain observations and numerical weather prediction models.
The language “AI weather” can easily become marketing fog, so the useful idea is simpler. Forecast models have systematic local errors. Observations reveal those errors. Machine-learning techniques can identify patterns between model predictions and actual local outcomes, then correct biases for a specific point or region.
That means the backyard station has two roles. It tells you what is happening now, and its observations become training and correction data for what the system thinks will happen next.
The network effect is important. One Tempest gives WeatherFlow one additional surface observation. Tens of thousands create a dense private network that fills gaps between traditional stations. More nearby stations can improve the system's ability to distinguish a local sensor anomaly from a real spatial weather pattern.
This is where Tempest stops being a gadget and starts looking like distributed infrastructure. Owners buy the hardware for themselves, yet collectively they help build a weather-observation network that no single household could create alone.
The hub is deliberately less interesting than the sensor
Sub-GHz radio gets the weather off the roof before Wi-Fi takes over.
The outdoor Tempest does not connect directly to a home Wi-Fi router. It communicates with an indoor hub using a long-range sub-GHz radio link, while the hub connects onward to the home's 2.4 GHz Wi-Fi network.
WeatherFlow says the sensor-to-hub link can exceed 1,000 feet in unobstructed line of sight. Real houses will reduce that range because walls, roofing, insulation, metal and interference all matter, but the architectural choice is sound. A purpose-built low-frequency telemetry link generally penetrates and travels differently from high-bandwidth Wi-Fi.
The split also protects power budget. The outdoor sensor can use a radio optimized for brief weather telemetry instead of maintaining a more power-hungry Wi-Fi relationship itself. The mains-powered indoor hub handles the internet connection.
The 2026 generation adds a slimmer, lower-profile hub. That is not a headline feature, but it reflects the maturity of the system. The outdoor device has the hard environmental job. The indoor bridge should simply disappear into the network and keep moving data.
For anyone who works with remote instrumentation, this architecture feels familiar. Put the sensing where the phenomenon is, then use a reliable low-power link to reach infrastructure with better power and connectivity.
A weather station can be perfectly precise and badly wrong
Siting is part of the instrument.
People naturally want one mounting location that gives perfect temperature, rainfall and wind measurements. Real property makes that difficult.
Wind wants exposure, ideally away from trees, walls and roof turbulence. Temperature wants representative ambient air rather than reflected heat from pavement or shingles. Rain sensing wants freedom from vibration and overhead obstruction. Solar radiation wants an open sky. Lightning sensing benefits from distance from noisy electrical sources.
Those requirements can conflict. Mounting high on a roof may improve wind exposure while increasing heat and turbulence. A low garden location may represent temperature beautifully while under-reporting wind because of fences and vegetation.
Tempest simplifies hardware installation by combining sensors into one body, but that also means the owner chooses a compromise location for the entire atmospheric package. The company's installation guidance therefore matters as much as the sensor specifications.
This is a broader lesson in measurement. Instruments do not observe reality in the abstract. They observe reality from somewhere.
The best home station is not necessarily the one on the highest pole. It is the one installed with a clear understanding of what conditions the owner most wants to characterize.
Smart-home integration makes weather operational
A local weather station is much more interesting when other systems can react to it.
Tempest integrates with services including Alexa, Siri, IFTTT and Rachio, and the platform offers data access and API integrations without requiring a consumer subscription for ordinary personal use.
The obvious use is irrigation. If the yard received meaningful rain overnight, a smart sprinkler controller does not need to rely only on a regional weather estimate. It can use local conditions to decide whether watering is necessary.
But the same principle extends to awnings, ventilation, outdoor lighting, garden alerts, freeze protection and energy management. A home that knows local temperature, wind, solar radiation and rain onset can make better decisions than one relying on a generalized weather app.
This is where the phrase “smart home” starts becoming useful rather than decorative. The intelligence is not asking a speaker for the temperature. It is letting environmental measurements affect physical systems automatically.
The weather station becomes a sensor node for the house.
Tempest came from a company that already lived inside weather data
The hardware was created to scale an observation network that had previously been expensive to build.
WeatherFlow's roots are older than the Tempest consumer product. The company had already spent years building proprietary weather information, specialized observation networks and forecasting services for outdoor, government and commercial users.
WeatherFlow-Tempest Inc. was formed in December 2018 around the opportunity to combine that meteorological background with cheaper sensors, modern radios, cloud infrastructure and machine learning. The new Tempest system was announced on Kickstarter in late 2019 and the campaign funded in less than three hours.
Retail sales launched in May 2020 after pandemic-era production complications. The original station's defining idea was already present: solid-state sensing with no traditional moving weather parts, solar power, wireless installation and a forecasting system that used the station's own local data.
By 2023, Tempest said the system had been on the market for three years and had grown from crowdfunding into a mainstream consumer weather platform. The network continued expanding, eventually exceeding 85,000 Tempest stations according to current WeatherFlow-Tempest business materials.
Tempest '26 is the first major hardware refresh that feels like a generational step rather than ordinary firmware evolution. It preserves the original concept while addressing power, sensor refinement, environmental durability and battery serviceability.
WeatherFlow builds expertise in private weather networks, forecasting and specialized atmospheric data.
WeatherFlow-Tempest Inc. is formed around a scalable personal-weather and data-network strategy.
Tempest launches on Kickstarter and is fully funded within hours.
Retail launch begins, establishing the solid-state, solar-powered Tempest architecture.
Firmware, forecasting and the Nearcast network improve while the installed station base expands.
Tempest '26 adds upgraded environmental sensors, larger solar panels, redesigned charging, improved coating and a replaceable battery.
The deeper engineering lesson
Maintenance is a sensor specification even when the spec sheet does not call it one.
A perfectly accurate instrument that needs constant cleaning, lubrication, battery changes and mechanical repair may collect worse long-term data than a slightly less perfect instrument that simply stays online.
Weather observations are especially sensitive to continuity. A missing week during a storm season cannot be reconstructed from your backyard later. A failed rain gauge does not merely inconvenience the owner. It creates a gap in the record.
Tempest's no-moving-parts philosophy is therefore more important than it first appears. Ultrasonic wind sensing eliminates cup and vane mechanics. Haptic rainfall eliminates tipping hardware. Solar power eliminates routine battery replacement. The 2026 removable LTO battery extends serviceability further.
This resembles good industrial product design. The system is designed not only to perform when new but to reduce the number of reasons it might stop performing after years outdoors.
For a weather station, uptime is part of accuracy because a sensor that is offline measures nothing perfectly.
There are tradeoffs
A compact all-in-one station is elegant because it removes complexity, and imperfect because nature rarely puts every measurement in the same ideal location.
The haptic rain sensor is not a laboratory weighing gauge. Ultrasonic wind can still be distorted by bad siting. Lightning sensing can encounter electrical interference. Temperature can be biased by nearby surfaces. Solar charging depends on exposure. Internet-based forecasting requires the hub and network path to remain available.
The combined sensor head also prevents an enthusiast from placing the rain gauge low, the anemometer high and the thermometer in a separately optimized radiation shield. Traditional multi-component stations can be more flexible when the goal is instrument siting that closely follows meteorological standards.
That is the trade Tempest deliberately makes. It prioritizes low maintenance, fast installation, network connectivity and integrated data processing over the modularity of a conventional enthusiast station.
For most homeowners, that trade is probably the reason the station gets installed at all.
The product is strongest when evaluated as a system rather than as a collection of isolated laboratory instruments. Hardware, calibration, forecasts, network effects, app access and smart-home integrations are the package.
Why it goes in the digital time capsule
Because it captures the moment weather observation became a networked household activity.
The Things Worth Wanting collection is interested in objects that collapse old boundaries. Tempest does that unusually well.
It is a weather instrument, but it is also a network node.
It measures your backyard, but its data helps inform a broader forecasting system.
It is solar-powered outdoor hardware, but its most valuable behavior may happen in software.
It has sophisticated atmospheric sensors, but one of its greatest accomplishments is that the owner rarely has to touch them.
The 2026 revision makes the story better because it shows the product maturing rather than merely accumulating features. Better rain and environmental sensing are useful. A redesigned charging system is useful. A replaceable battery is especially useful because it acknowledges that long-lived infrastructure should be repairable at the component most likely to age first.
I also like what Tempest says about scale. Government weather networks remain essential because they provide carefully sited, standardized observations. Personal stations do not replace them. They add density. Tens of thousands of imperfect but continuously validated local observations can reveal spatial detail that sparse professional networks cannot provide alone.
That is a very twenty-first-century idea.
The backyard stops being merely the place where weather happens to you. It becomes one small instrument in the system trying to understand what the atmosphere will do next.
Tempest belongs in the time capsule because it made personal meteorology feel less like a hobby station on a pole and more like distributed environmental infrastructure.
A few practical questions
About the current Tempest Weather Station
Is there a newer Tempest model in 2026?
Yes. Tempest '26 is the current generation. It retains the core Tempest design but adds upgraded temperature, humidity and rain sensing, larger solar panels, a redesigned charging system, improved environmental protection, a slimmer hub and a replaceable battery.
Does Tempest have moving weather-sensing parts?
No traditional moving measurement parts are used. Wind is measured ultrasonically and rain is detected with a haptic impact sensor rather than spinning cups, a wind vane or tipping bucket.
How often does Tempest measure wind?
At full operating power, the ultrasonic anemometer samples wind every three seconds. The system reports one-minute observations, with gust and lull derived from the shorter samples.
How far away can Tempest detect lightning?
The current product page lists lightning detection up to about 25 miles.
Does Tempest need a subscription?
No subscription is required for ordinary personal access to station data, forecasting and supported consumer integrations.
How is the outdoor station powered?
The sensor is solar powered with an onboard rechargeable lithium-titanate battery. Tempest '26 makes that internal battery replaceable.
How does Tempest connect to the internet?
The outdoor sensor communicates with the included indoor hub using long-range sub-GHz telemetry. The hub connects to the home's 2.4 GHz Wi-Fi network.
What warranty does the current Tempest have?
WeatherFlow-Tempest currently lists a two-year consumer warranty and a 60-day money-back trial for the home Tempest Weather Station.