Yosemite National Park Weather in September
What's the weather like in Yosemite National Park (California) in September 2025?
The climate in Yosemite National Park during September can be summarized as mild and dry.
September is in the fall / autumn in Yosemite National Park and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a cool 21°C (69°F), whilst at night 4°C (39°F) is normal.
| Daytime temperature | 20.7°C 69.3°F |
|---|---|
| Nightly temperature | 4.1°C 39.4°F |
| Average temperature | 12.4°C 54.3°F |
| Daily sunshine | 11 hrs |
| Avg rainfall | 21 mm 0.8 ins |
| Rainy days | 5 days |
| Sea temperature | 16.4°C 61.5°F |
| Humidity | 50% |
| Windspeed | 12.6kph 8 mph |
On average September is the 3rd driest month of the year in Yosemite National Park with around 21mm 0.8 inches of rain making it a dry 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 11 hours of sunshine per day.
September temperatures in Yosemite National Park
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 Yosemite National Park in September 2025.
Other monthly averages
Best places to visit in September
Yosemite National Park weather stats
| Hottest month: | July | 24.6°C 76.3°F |
|---|---|---|
| Driest month: | August | 15mm 0.6ins |
| Sunniest month: | July | 12.9hrs |
| Coldest month: | January | 4.8°C 40.6°F |
| Wettest month: | January | 158mm 6.2ins |
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