We been very fortunate this August in middle Tennessee. Last summer at this point we were seeing highs well over 100 every day, and today I don't think it's even topped 80! (of course it's been raining all day). Still, it will be another month and a half at least before Fall comes here. Last year Fall came so late that there were still colored leaves on the trees in December.
I should point out that, to me, even 80 F is too much. I prefer 60s or less, and can't wait for winter.