I can always tell when the days are taking slow, small baby steps away from the summer. Barely noticeable unless you are looking for it; the evenings are a bit cooler, the shadows are a bit longer, the middle of the day is almost unbearably hot but the early and late evening is a pleasant cool.
Teachers in my school district have returned to work, students start school on Monday. Teachers in other school districts have been back for a couple of weeks now, and kids went back last week. School supplies are abundant in the stores.
I miss the getting my classroom ready part of the school year. But that's about it!