I dont know how bad the rain is there. but, we had a pretty decent rain storm about 2 months ago and went and rode anyways, we threw the bimini up, put on our wet suits, and wore hoodies all day, it was freezing, but we had flat water all day.
rain normally means no one out there but fishermen, which means good water.
just make sure you drive the same direction the rain is falling, it sucks riding into the rain. you cant see anything