Yosemite Valley Weather in September

What's the weather like in Yosemite Valley (California) in September 2025?

The climate in Yosemite Valley during September can be summarized as mild and dry.

September is in the fall / autumn in Yosemite Valley and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 5°C (41°F) is normal.

Yosemite Valley weather averages (imperial / metric)
Daytime temperature 22°C 71.5°F
Nightly temperature 5.1°C 41.1°F
Average temperature 13.5°C 56.3°F
Daily sunshine 11.2 hrs
Avg rainfall 20 mm 0.8 ins
Rainy days 4 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 Valley with around 20mm 0.8 inches of rain making it a dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 11.2 hours of sunshine per day.

September temperatures in Yosemite Valley

Yosemite Valley average temperature in September

September rainfall

Yosemite Valley average rain in September

September hourly sunshine

Yosemite Valley average rain in September

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 Valley in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Yosemite Valley weather stats

Yosemite Valley weather statistics
Hottest month: July 25.9°C 78.6°F
Driest month: August 13mm 0.5ins
Sunniest month: July 13.1hrs
Coldest month: December 5.5°C 41.9°F
Wettest month: January 158mm 6.2ins
Map showing location of Yosemite Valley (37.74075, -119.57788) Yosemite Valley map pin © Google

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