Fall?

My lawn is more or less covered in leaves. It’s that time of year, I suppose, and it means that there will be raking taking place in the next week or two. Here’s the weird thing: it’s still in the upper 80s and low 90s here. There is some sort of cosmic incongruity when the temperature is 89 degrees out and there are leaves all over the yard. The leaves indicate fall. The angle of the sun in the sky indicates fall. But the temperature still says summer. It’s unsettling.