June in Florida can bring all kinds of different weather from Heat & Humidity to Hurricanes. It is also the start of the raining season. I recommend some kind of back-up plan just in case. You do need to consider the time of day & your guest. If they are elderly or not used to the humidity you should consider chairs, a tent for shade even if it set to the side of the wedding, bottled water is a good option and you can have them made with your wedding date & names. You can also consider having the ceremony earlier as this would allow you to push back the time if there is rain. Most of the larger resorts will have tents provided. Most importantly check with your wedding planner or whoever you signed a contract with about their options. The good ones will try to do everything they can to still make that day special even with bad weather. Also check the hotel you stay at and a few indoor location on their policy for last minutes cancellations or even last minute availability if you are forced indoors. One last thing that's is more important for larger weddings, that might help is to not plan the wedding on your last day in town
Daniel