AU
Level 1Exercise normal precautions
Exercise normal precautions
United States · California · September
California in Septemberhow the month reads
September is one of the strongest months for California inside United States, with warmer than the yearly mean by 7.1°C. The safety bulletins below apply.
- Rank
- 2 of 12
- Score
- 90/100
September match
90/100
Free-tier default preferences.
What’s open · September
Things to do in California in September
- At its best
- OpenGlacier Point Road, Yosemite
Source: nps.gov
Opening seasons are checked by hand against the operators and parks themselves, not derived from the climate figures on this page. Last reviewed 2026-08-28. Dates move — confirm before you book.
- Temperature29°C+7.1°C vs. yearly mean
- Month rank2 of 12for California
- Best monthsMay · September · Octoberhighest regional score
12-month temperature · California
September in context
View data table
| Month | Average daytime high (°C) |
|---|---|
| January | 12.5 |
| February | 14.2 |
| March | 15.9 |
| April | 20.7 |
| May | 24.4 |
| June | 30.0 |
| July | 33.3 |
| August | 32.6 |
| September | 29.3 |
| October | 23.9 |
| November | 17.1 |
| December | 12.7 |
Safety · 4 governments
What the governments say about United States
Combined advisory · most-cautious-wins
Exercise normal precautions
Highest level across 4 governments · Advisory last changed
See breakdown by countryHide breakdown
CA
Level 1Exercise normal precautions
Exercise normal precautions
DE
Level 1Exercise normal precautions
Exercise normal precautions
NL
Level 1Exercise normal precautions
Exercise normal precautions
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