We Florida people have nothing but moist air. Especially in the summer. Most of my flights have been right have it rains (the time I usually get home) and some in little drizzle. Haven't had an issue. In fact I think it flies pretty nicely in the thick moist air.
I've flown in fog, fact of life on the ocean. Everything was dewy but not an issue at all. Of course, I have plunged into a river and lived to fly again. That...was wet.
I have flown in fog but in all honesty the worst crash I have ever had actually happened in thick fog and I am still not sure what exactly caused the problem. I advise against moist weather.