Weather Sources
weNow queries multiple weather services at the same time and combines their forecasts into a single consensus prediction. Here's how it works and which sources are used.
Current Sources
The free tier queries 2 sources. weNow Advanced unlocks 4 additional sources for a tighter consensus — 6 in total.
| Provider | Forecast Model | Tier | Website |
|---|---|---|---|
| Open-Meteo | ECMWF (European model) | Free | open-meteo.com |
| OpenWeatherMap | GFS (US model) | Free | openweathermap.org |
| WeatherAPI | Blended | Advanced | weatherapi.com |
| Visual Crossing | Blended | Advanced | visualcrossing.com |
| Apple WeatherKit | Blended (Apple) | Advanced | developer.apple.com/weatherkit |
| Google Weather | Blended (Google) | Advanced | developers.google.com/.../weather |
How the Consensus Works
- All sources are queried at once -- If one source is slow or down, the others still work. You always get a result.
- Forecasts are normalized -- All temperatures are converted to Celsius and all wind speeds to m/s, so they can be compared fairly.
- A weighted median is computed -- Sources powered by higher-quality forecast models (like the European ECMWF model) count more than blended models. This produces a more accurate consensus.
- Outliers are removed -- If one source gives a wildly different reading, it's excluded from the final result to avoid skewing the consensus.
Confidence Colors
The colored badge on the weather card tells you how much the sources agree:
| Color | What It Means |
|---|---|
| Green | High confidence -- sources agree within 1.5 degrees C |
| Yellow | Moderate confidence -- some disagreement (within 3 degrees C) |
| Red | Low confidence -- sources disagree by more than 3 degrees C |
Forecasts
The consensus approach also applies to forecasts:
- Daily forecast -- Up to 7 days ahead, combining predictions from all sources
- Hourly forecast -- Up to 48 hours ahead, for more granular planning