I use Meteoblue as weather-App. It has a rain forecast and radar.

But always put up your tent before getting drunk!

Not for Route calculation. But you can use the googlemaps interface as an overlay.

https://hoerli.net/osmand-google-traffic-anzeigen/ It’s German, but the pictures should be enough.

Don’t use shellac for tables or furniture you sweat on. It’s not water resistant. I had an old desktop with shellac finish, the finish started to dissolve on the parts where my arms rested.