Actually your azaleas will love humidity. The key is to space them enough to allow ample air circulation, thus reducing the chance of mildew, etc.
As to timing, I have about forty azaleas in my collection. The domestic types tend to behave themselves predictably, but the satsuki have their own drummer. I’ve had a hinomaru bloom in November. My observation is that satsuki, and to a lesser degree azaleas generally, will react to environmental changes by throwing a blossom or two. For example I’ve purchased trees from California that have already bloomed, and once they are acclimatized to midwestern summer conditions they produce a few blossoms as if just to say hello.