I don`t find any possibility to stop my abonnement.

@Korina Yes it does. Follow my link. The yellow bar on the Bottom side of the map is an estimation of the future situation in 5min steps. Thats what i meant.

If the premium Version of the app would include forecast in 5min steps for rain in the next hour, like weather Radar but estimated one hour in the future, I would totally buy premium.
Here`s an example, where the missing feature is included
https://www.wetteronline.de/regenradar?wrp=periodCurrentHighRes

Greets
Lukas