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The weather in California in September is hot. The average temperatures are between 21°C and 31°C.
There shouldn't be any rainy days in in California during September. Having said that, the days are very hot in September so hanging out outside is more recomanded during the after noons and evening time.
Our weather forecast can give you a great sense of what weather to expect in California in September 2025.
If you’re planning to visit California in the near future, we highly recommend that you review the 14 day weather forecast for California before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 21° / 11° | 3 | 28 | 0 | 58 mm | Good | California in January |
| February | 20° / 11° | 2 | 27 | 0 | 56 mm | Good | California in February |
| March | 22° / 12° | 2 | 29 | 0 | 34 mm | Good | California in March |
| April | 24° / 13° | 1 | 29 | 0 | 18 mm | Perfect | California in April |
| May | 25° / 15° | 0 | 31 | 0 | 4 mm | Perfect | California in May |
| June | 27° / 17° | 0 | 30 | 0 | 1 mm | Perfect | California in June |
| July | 30° / 20° | 0 | 31 | 0 | 5 mm | Good | California in July |
| August | 31° / 21° | 0 | 31 | 0 | 3 mm | Good | California in August |
| September | 31° / 21° | 0 | 30 | 0 | 4 mm | Good | California in September |
| October | 27° / 18° | 1 | 30 | 0 | 10 mm | Perfect | California in October |
| November | 24° / 14° | 1 | 29 | 0 | 22 mm | Perfect | California in November |
| December | 19° / 11° | 3 | 28 | 0 | 66 mm | Good | California in December |
For a more accurate weather forecast please select a city