Click on a day for an hourly weather forecast
The temperatures in San Clemente in September are comfortable with low of 10°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in San Clemente during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in San Clemente in September 2026.
If you’re planning to visit San Clemente in the near future, we highly recommend that you review the 14 day weather forecast for San Clemente before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 30° / 18° | 8 | 23 | 0 | 162 mm | Ok | San Clemente in January |
| February | 28° / 17° | 8 | 20 | 0 | 153 mm | Good | San Clemente in February |
| March | 26° / 14° | 6 | 25 | 0 | 112 mm | Perfect | San Clemente in March |
| April | 23° / 12° | 4 | 26 | 0 | 72 mm | Perfect | San Clemente in April |
| May | 19° / 9° | 1 | 30 | 0 | 23 mm | Good | San Clemente in May |
| June | 17° / 7° | 1 | 29 | 0 | 12 mm | Good | San Clemente in June |
| July | 16° / 6° | 1 | 30 | 0 | 6 mm | Good | San Clemente in July |
| August | 19° / 8° | 0 | 30 | 0 | 7 mm | Good | San Clemente in August |
| September | 21° / 10° | 3 | 27 | 0 | 50 mm | Good | San Clemente in September |
| October | 23° / 12° | 7 | 24 | 0 | 112 mm | Good | San Clemente in October |
| November | 26° / 15° | 9 | 21 | 0 | 180 mm | Good | San Clemente in November |
| December | 29° / 17° | 8 | 23 | 0 | 138 mm | Ok | San Clemente in December |