Let me introduce you to:

"The last beautiful day of the summer"

It's a traditional way of life starting in late August, early September.

Whenever the weather is kind of ok, you say "it's the last beautiful day of the summer", sit outside, have a drink and don't do whatever else you should be doing because, boy, it's gonna be rainy and cold soon enough.

Is it really the last beautiful day of the summer? Who knows.

It could be.

Enjoy it.