Can anyone recommend a good app to replace it? No ads, lightweight etc.

If you are interested in German weather, I can recommend the DWD WarnWetter App. It is so good that the competitors sued when it was free. Now it costs a one-time fee of about 3€.

I’ve been happy with Carrot.

MyRadar, but a bit of the opposite.

I've learned that I just want to look at the radar. There's a big difference between "it's going to drizzle all day" and "spotty storms within 25 miles of you"

https://weather-sense.leftium.com: just a web app, but you can add it to your home screen to access like an app[1]

[1]: https://polarhabits.com/mobile

Edit: Google Gemini suggested Hello Weather and loving it so far.