Hello! I'm looking for a foss weather app for android, so I went ahead to f-droid and tried a bunch of them, but didn't find any that fully satisfies me: I want to be able to see the hourly forecast of any day of the week, not just the "global" forecast, and I want the weather service used not to require a credit card (openweathermap.org for example requires the credit card to get an API key). Geometric Weather is the one that I'm currently using, with open-meteo as provider, but sadly it displays hourly forecasts only for the current day, but not for other days.
The Breezy Weather (fdroid link) is a fork and continuation of GeometricWeather. As I can see, there are hourly forecasts for the next days, just scroll horizontally (AccuWeather and Open-Meteo providers, tho, I haven't checked others).
I just wish it had a precipitation radar. I'm pretty sure the data is available because I've seen another FOSS app that had it, but I can't remember which now.
OSS Weather has decent radar for rain and solid stats in the home screen too. There's three different sources for weather data you can select, so I'd bet one will be better than the others for radar mapping.