Where to go in September
Where the weather is just right in September in the US
In September, San Francisco has the most just-right days (15 of 30), followed by Chula Vista (12) and Portland (11).
Just right means 70 to 80°F highs, a dew point under 60°F and mostly sunny skies. Ranked among the 100 largest US cities. See every place on the September map →
See the worldwide September list →
| # | Place | Just-right days | Share | Avg high |
|---|---|---|---|---|
| 1 | San Francisco California | 15 | 50% | 76°F (24°C) |
| 2 | Chula Vista California | 12 | 40% | 75°F (24°C) |
| 3 | Portland Oregon | 11 | 36% | 76°F (24°C) |
| 4 | Oakland California | 10 | 34% | 81°F (27°C) |
| 5 | Reno Nevada | 10 | 32% | 82°F (28°C) |
| 6 | Colorado Springs Colorado | 10 | 32% | 70°F (21°C) |
| 7 | Denver Colorado | 9 | 29% | 81°F (27°C) |
| 8 | Aurora Colorado | 9 | 29% | 81°F (27°C) |
| 9 | Tri-Cities Washington | 9 | 29% | 81°F (27°C) |
| 10 | Seattle Washington | 9 | 29% | 71°F (22°C) |
| 11 | Boise Idaho | 9 | 28% | 82°F (28°C) |
| 12 | Albuquerque New Mexico | 8 | 25% | 83°F (28°C) |
| 13 | Lincoln Nebraska | 7 | 24% | 79°F (26°C) |
| 14 | San Jose California | 7 | 23% | 83°F (28°C) |
| 15 | Fremont California | 7 | 23% | 83°F (28°C) |
| 16 | Chicago Illinois | 7 | 22% | 74°F (23°C) |
| 17 | Omaha Nebraska | 7 | 22% | 78°F (26°C) |
| 18 | Cleveland Ohio | 6 | 21% | 75°F (24°C) |
| 19 | Milwaukee Wisconsin | 6 | 21% | 71°F (22°C) |
| 20 | Madison Wisconsin | 6 | 20% | 73°F (23°C) |
Cite this
In September, San Francisco averages 15 just-right days in the US(70 to 80°F highs, dry, mostly sunny), according to Goldilocks Map: https://goldilocksmap.com/where-to-go/september/us/Expected days in a typical September, from 1991 to 2020 climate normals. Method and accuracy. Updated 2026-10-07.