I have had trouble with two of my cakes covered with fondant sweat on rain/humid days this summer. I have tried plastic wrap, but they still sweat after I take it off. Does any one have any tips?

Are you refrigerating your cakes? It is very hot and humid here in Arkansas and the ONLY time I've had a problem like this is the ONE time I refrigerated my cake.

Humidity isn't a problem with a cake that is left at room temperature. I've never had a problem with "sweating" fondant if the cake is never refrigerated. I never cover/wrap my fondant cakes with plastic wrap either .

I don't use perishable fillings so there is never a reason to. I do use milk (half and half) in my buttercream but it also requires no refrigeration.

Plastic wrap holds in moisture... Keeping your fondant cakes in a bakery type box would allow for air circulation.