Sit start with left hand on side pull low down on the left side of arrete. Follow arrete all the way around the right corner. Top out to the right on arrete on good holds.
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.