We almost always go in early to mid June. We expect it to be hot and humid and expect for the showers to come. On days that it doesn't rain, well that's just icing on our Disney cake! We also get in the parks early and take a break mid-day and then hit the parks again at night. We carry our ponchos and don't let the rainshowers bother us too much. This past June, one of those "afternoon showers" turned into an all-nighter. I wish we had realized that possibility and didn't just assume that it would stop. It is beginning to get crowded by then, but certainly is manageable.