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The weather in Santa Monica in September is hot. The average temperatures are between 20°C and 29°C.
There shouldn't be any rainy days in in Santa Monica 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 Santa Monica in September 2025.
If you’re planning to visit Santa Monica in the near future, we highly recommend that you review the 14 day weather forecast for Santa Monica before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 20° / 11° | 3 | 28 | 0 | 80 mm | Good | Santa Monica in January |
| February | 20° / 11° | 2 | 26 | 0 | 68 mm | Good | Santa Monica in February |
| March | 21° / 12° | 2 | 29 | 0 | 47 mm | Good | Santa Monica in March |
| April | 23° / 13° | 1 | 29 | 0 | 18 mm | Perfect | Santa Monica in April |
| May | 24° / 15° | 1 | 31 | 0 | 8 mm | Perfect | Santa Monica in May |
| June | 26° / 17° | 0 | 30 | 0 | 2 mm | Perfect | Santa Monica in June |
| July | 28° / 19° | 0 | 31 | 0 | 10 mm | Perfect | Santa Monica in July |
| August | 29° / 20° | 0 | 31 | 0 | 5 mm | Good | Santa Monica in August |
| September | 29° / 20° | 0 | 30 | 0 | 7 mm | Good | Santa Monica in September |
| October | 27° / 18° | 1 | 30 | 0 | 12 mm | Perfect | Santa Monica in October |
| November | 23° / 14° | 1 | 29 | 0 | 23 mm | Perfect | Santa Monica in November |
| December | 19° / 11° | 3 | 28 | 0 | 72 mm | Good | Santa Monica in December |