4Cast Support

4Cast is a weather app for iPhone and iPad running iOS 27 or later, with an app for Apple Watch. It shows current conditions, minute-by-minute precipitation, 48-hour and 10-day forecasts, radar, and severe weather alerts.

Frequently asked questions

Why does 4Cast ask for my location?
To show weather where you are. You can decline and add places yourself on the Places tab.

Why is the next hour's rain sometimes missing?
Minute-by-minute precipitation is available only in regions where Apple Weather provides it.

How do I change units?
On the Sky tab, tap the place's name, then Settings, then Units.

Where does the data come from?
Forecasts and alerts come from Apple Weather. From version 1.5, the rest comes from public weather services:

• Rain on the map: radar from NOAA in the United States and from the Japan Meteorological Agency in Japan; rain seen from space by EUMETSAT across Europe, Africa, and much of Asia; NOAA's forecast model everywhere else.
• The map's temperature, wind, and cloud layers: NOAA's Global Forecast System.
• Air quality: the monitors of the U.S. EPA's AirNow where one is near; the Finnish Meteorological Institute's SILAM model elsewhere, for the hours ahead, and on the map.
• Warning areas in the United States: the National Weather Service.

Versions before 1.5 took air quality and the map's other layers from Open-Meteo and radar from RainViewer.

Contact

Questions or problems: open an issue on GitHub.

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