I use the built in weather app on my iPhone. I’ve never seen any ads in it, so I don’t know what “ads and tracking data” you’re referring to. The app does update on a minute-to-minute basis when it’s raining out, though. It looks like this [1] and it doesn’t just scroll left on a local timer. The magnitude of the predictions in the graph change on a minute to minute basis and can disappear entirely, giving a very nice prediction of when the rain will stop so that I can go out and expect not to get wet.

[1] https://iphonesoft.fr/images/2021/02/meteo-14.5-ios.jpg