Get yourself a government funded (well, taxpayer funded) weather forecast page. Quite accurate forecasts for weather, rain, cloudiness (including simulated radar models). Also radar images for cloudiness and rain. And free historic data. Without ads.
I use WTForecast. It’s funny. I guess I technically also use the default Android weather app, because my lock screen has rain or snow on it when either is happening outside, it’s kinda neat.
It’s free/libre, open source and has accurate doppler radar and forecasts. It’s one of those get what you pay for deals except he doesn’t sell your data.