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bonsai171. Don't worry about it.
People in the rest of the country hear "Hotlanta" and think this is Death Valley or something. New Jersey is often more humid than Atlanta and it rarely gets over 100 degrees. Just use common sense - take it easier, ride early if possible and hydrate well. You will be fine.
I love the heat personally, and love to bake. Craft summer base layers work well for me.
One great thing about the south are warm summer nights, great for night riding with a light. I'm heading out tonight at 9:30 PM for 30 miles.
Another benefit is that Georgia dogs stay under the pickup truck when it gets over 95° so you don't even need to bring pepper spray.
-Tim-