September brings different days. It will be hot, but the humidity will be lower. Nights bring temperatures just above 70 degrees, which is a lower temperature than the setting on most air conditioners.
The clouds are different. Where Summer brought towering cumulus clouds, early Fall brings thin stratus, that offer moments of cool, while they shade for a few moments.
Most of all, it's obvious the weather is changing. Soon, a front will bring temperatures much lower, and the fog. The frontal passage will bring brilliant blue skies, and clear nights, but soon, the fog will form in the night, and driving will be hazardous.
We're at the last of our constant vigil for hurricanes. Fronts push them away, and the apprehension finally leaves. This year was bad, but many are not. It's a good thing to not have any dangerous weather, and it allows moments of peace as the seasons change.