San Clemente Weather in September
What's the weather like in San Clemente (Maule) in September 2025?
The climate in San Clemente during September can be summarized as mild and a little damp.
September is in the spring in San Clemente and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a cool 17°C (62°F), whilst at night 5°C (41°F) is normal.
| Daytime temperature | 16.5°C 61.6°F |
|---|---|
| Nightly temperature | 4.8°C 40.6°F |
| Average temperature | 10.6°C 51.1°F |
| Daily sunshine | 6.6 hrs |
| Avg rainfall | 90 mm 3.5 ins |
| Rainy days | 5 days |
| Sea temperature | 12.9°C 55.1°F |
| Humidity | 78% |
| Windspeed | 8.3kph 5 mph |
On average September is the 5th wettest month of the year in San Clemente with around 90mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.6 hours of sunshine per day.
September temperatures in San Clemente
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Clemente in September 2025.
Other monthly averages
Best places to visit in September
San Clemente weather stats
| Hottest month: | January | 27.3°C 81.1°F |
|---|---|---|
| Driest month: | February | 11mm 0.4ins |
| Sunniest month: | February | 11hrs |
| Coldest month: | July | 12.2°C 54°F |
| Wettest month: | June | 215mm 8.5ins |
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