went last year 4th june for two weeks it was lovely all day till about 3 or 4 then rained very heavy for an hour or two then cleared up most evenings but it didnt effect our fun and i enjoyed the thunder storms anyway
Yeah - that's when I'm going to be there. The rain storms can be quite good for clearing some people out of the parks - they never last too long and at the Disney parks at least (and USF) there are usually enough indoor things to do.