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xkcd #2825: Autumn and Fall
(imgs.xkcd.com)
Alt text:
Of course in reality this is just a US/UK thing; in British English, 'fall' is the brief period in between and 'autumn' is the main season.
Or as we call it in the Southern U.S., "Summer Lite," where the daily high temps are finally at or below 90°F a good bit of the time. We keep getting teasers of autumn, but it'll be a week or two depending on where you live. The heat index in Houston looks to be 105°F today, so autumn is still a little ways off. Ouch.