Where you'll be makes a lot of difference. Two things you can depend on anywhere are BUGS and RAIN. Cold should not be a problem. I've suffered bugs in late August so intense I couldn't get out of the tent for days at a time, except when it was pouring rain. Some places worse, some better: skeeters, no-see-ums, and worst of all white-sox, which are tiny black flies with white feet that will bite through most clothing and burn and itch for two weeks. Rain and bugs. Bugs and rain.