San Bernardino Weather in September
What's the weather like in San Bernardino (Cordillera) in September 2024?
The climate in San Bernardino during September can be summarized as warm and damp.
September is in the spring in San Bernardino and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a comfortable 26°C (79°F), whilst at night 16°C (60°F) is normal.
| Daytime temperature | 26°C 78.8°F |
|---|---|
| Nightly temperature | 15.6°C 60.1°F |
| Average temperature | 20.8°C 69.4°F |
| Daily sunshine | 7.1 hrs |
| Avg rainfall | 108 mm 4.2 ins |
| Rainy days | 5 days |
| Sea temperature | 17.9°C 64.1°F |
| Humidity | 67% |
| Windspeed | 13kph 8 mph |
On average September is the 4th driest month of the year in San Bernardino with around 108mm 4.2 inches of rain making it a 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 7.1 hours of sunshine per day.
September temperatures in San Bernardino
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 Bernardino in September 2024.
Other monthly averages
Best places to visit in September
San Bernardino weather stats
| Hottest month: | January | 32.5°C 90.5°F |
|---|---|---|
| Driest month: | July | 69mm 2.7ins |
| Sunniest month: | December | 9.6hrs |
| Coldest month: | June | 22°C 71.6°F |
| Wettest month: | January | 166mm 6.5ins |
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