we have gone in June several times. Its hot, muggy and it RAINS almost everyday. But we keep going back because if you work around it, its not really that bad. Usually your mornings are wonderful so if you get up and get started early, plan breaks in the afternoon when the heat is up and the rain comes, and then go back in the evening its really not bad.
We were also there this year, and the rain was worse than it usually is, but its not stopping us for planning another trip for this time next year!