Windy can help you plan, but its accuracy at your spot depends on the forecast model and local conditions. Compare the forecast with observations at the same time and location before deciding which model to trust for your sessions.
This guide refers to Windy.com and its mobile app. Windy.app is a separate service.
Editorial correction, September 12, 2026: earlier versions quoted a 12-spot test and a 70% result without publishing the underlying observation records. Those claims have been removed. This page explains a repeatable comparison method instead.
What “accurate” means for a wind forecast
For a rider, a forecast can get the broad pattern right and still miss the usable window. You might care about wind arriving before sunset, a direction staying side-on, or gusts staying within your equipment’s range. A single daily average cannot answer all of those questions.
Choose the question before you measure performance. For example: “Did the forecast put the afternoon wind inside my planned range?” is different from “Was every hourly speed within two knots?” Neither result should be presented as a universal score for an app.
Compare like with like
| Record | Why it matters |
|---|---|
| Forecast model | Apps can display different models |
| Time the forecast was issued or saved | A newer forecast has information an older one did not |
| Forecast target time | Match the observation to that time, not the time you opened the app |
| Average wind and gusts separately | A gust is not the same measurement as sustained wind |
| Units and direction | Convert speeds and compare bearings consistently |
| Station and observation timestamp | Nearby or recent-looking data can still describe a different place or hour |
Windy.com lets you inspect forecasts and weather information; the app name alone is not the model. Keep the selected model consistent when you compare days, and note any change.
Check whether the station represents your launch
A station provides a measurement at its own sensor. Buildings, headlands, elevation and distance from the water can make its reading differ from the beach. A measurement is useful evidence, but it is not automatically the wind where you intend to ride.
Check the station location and its update time. Windfinder’s measurement documentation illustrates why this matters: stations have different reporting intervals, and irregular reporting can indicate maintenance problems.
Run a useful local comparison
- Pick one representative station and a forecast location near it.
- Save tomorrow’s forecast at a consistent time each day. Record the model and units.
- After the forecast hour passes, record the corresponding station observation.
- Separate average wind from gusts. Mark missing readings instead of guessing.
- Calculate forecast minus observed speed for each pair. A positive result means the forecast was higher.
- Look for recurring differences by direction, time of day and weather pattern.
A spreadsheet with these columns is enough to start: date, forecast saved at, model, target hour, forecast wind, observed wind, gusts, direction, station, notes. Keep the sample count and date range beside any summary you share. Several matching days are useful local evidence, not proof of performance in every season.
Use the wind-speed converter when your forecast and station use different units.
Use the forecast and observation for different decisions
Use the forecast to plan when to check conditions. As the session approaches, look at recent observations and what is happening at the spot. Recheck local hazards and equipment limits rather than treating a matching wind speed as a safety clearance.
WindUp can alert you when a supported station matches your selected thresholds. It does not certify that a forecast was correct or that a session is safe. Choose a wind alarm for your spot if the missing step is noticing a change while you are away from the weather app.
If you are choosing software, read the Windy.com review or compare Windy alternatives.
