If while an apocalyptic storm (we've had something like that these days), I stay at home to write my novels with a cup of hot tea on the desk, sometimes watching out of the window... joking! Going to school of course, and doing homework after that. Then... as much tea+writing as I can :)
If it isn't too strongly raining, just live normal life under my umbrella, maybe spending a little more time in sweetly deep melanchonic thoughts, or oppositely smiling and feeling cheerful. Rain brings out my opposite edges, no average feelings/behaviours admitted!