I'll add my two cents also (that's about all its worth anyways
We went in late May several years back. Rained probably half the days (more like a misty rain), with one of the days being a hard, blustery rain. And there was some fog, but again, it didn't put a damper on the fun we had. In fact, we enjoyed frolicking in the rain like little kids! We still had an unbelievable time.