Obviously a summer month. Fall doesn't begin until Septemeber 21. Summer begins at June 21. Anything that falls between these two dates is summer. August falls completely in the summer. This would be a better question if you were asking if June or September were summer months, but August is obviously a summer month.
Scientifically speaking, it's within the dates of summer. But some people who live in extreme conditions would consider it fall, based on the conditions. It's still well over 90 degrees on most August days here, so yeah I'm gonna say summer.
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