September weather forecast and climate
San Clemente, CA

Average sea temperature in September - San Clemente, CA
  • Average sea temperature in September: 67.1°F

The best month for swimming (with the highest average sea temperature) is August (68.3°F).
Coldest months (with the lowest average sea temperature) are January and February (58.9°F).

Average daylight in September - San Clemente, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

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