United States in September
September is United States's 4th-best month (rank 4 of 12): its 173 destinations average 75/100, led by San Francisco at 96 — 21°C and 1 rainy day — while Gates of the Arctic National Park is cooler at -3°C and scores 65.
#4 of 12 months for United States · 173 destinations · updated September 2026 · climate normals from ERA5 reanalysis
🇺🇸 United States, month by month
75/100 in SeptemberWhere in United States in September
Comfort is SeasonMap's 0–100 score; each place is judged through the lens that suits it — beaches on beach weather, ski resorts on snow. "At its best" means September is one of that place's own top three months. Feels-like highs fold in humidity, wind and sun.
What's on in United States in September
- Summer peak · South Lake Tahoe · 20 Jun – 7 Sep
- Labor Day weekend · South Lake Tahoe and 42 more places · 5–7 Sep
- Hope Valley aspens · South Lake Tahoe · 25 Sep – 15 Oct (usually)
- Portland Marathon · Portland · 28 Sep – 8 Oct (usually)
- Golden eagle migration · Bozeman · 15 Sep – 31 Oct (usually)
- Bridger Raptor Festival · Bozeman · 28 Sep – 6 Oct (usually)
- Milky Way season · Bryce Canyon National Park · 1 May – 30 Sep (usually)
- Aspens on the plateau · Bryce Canyon National Park · 20 Sep – 15 Oct (usually)
Seasons in force
Hurricane season · 34 placesTrail season · 31 placesExtreme heat · 29 placesSmoke season · 28 placesSummer season opens · 27 placesFlood season · 15 placesSea warm enough · 12 placesStorm season · 10 placesInsects & disease · 9 placesMonsoon · 9 placesHarvest · 7 placesOff-season shutdown · 7 placesAlgae & red tide · 6 placesDry season · 4 placesForaging season · 4 placesDust season · 2 placesSki season · 2 placesVolcanic activity · 2 placesWind season · 2 placesRip currents & big surf · 1 placeSargassum season · 1 placeSurf season · 1 placeTrade-fair week · 1 place
Peak crowds at 75 of United States's 106 well-known places this month.