Top Definition
That type of weather that usually starts to roll around towards the end of the summer, when the warm sun is out, yet there is a cool breeze, like the temperature feels like September-ish.
"What a beautiful day, I'm really loving this Septemperature! Perfect for short sleeves or long, pants or shorts, God I love Septemperature!"
by slywordman September 28, 2011

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