Meteorological Summer ended 9 days ago. The weather is definitely looking fall-like over the coming week, with many areas looking likely to see the 40s for lows and upper 60s to low 70s for highs.
I don't know if we'll see 30s as the GFS is hinting at (I've seen 30s in late September here) but do think upper 40s/low 50s will be wide spread.