Mount Shasta Weather in September

What's the weather like in Mount Shasta (California) in September 2025?

The climate in Mount Shasta during September can be summarized as mild and dry.

September is in the fall / autumn in Mount Shasta and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (76°F), whilst at night 5°C (41°F) is normal.

Mount Shasta weather averages (imperial / metric)
Daytime temperature 24.2°C 75.6°F
Nightly temperature 4.8°C 40.6°F
Average temperature 14.5°C 58.1°F
Daily sunshine 11.3 hrs
Avg rainfall 25 mm 1 ins
Rainy days 5 days
Sea temperature 13.9°C 56.9°F
Humidity 57%
Windspeed 10.8kph 7 mph

On average September is the 4th driest month of the year in Mount Shasta with around 25mm 1 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 11.3 hours of sunshine per day.

September temperatures in Mount Shasta

Mount Shasta average temperature in September

September rainfall

Mount Shasta average rain in September

September hourly sunshine

Mount Shasta 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 Mount Shasta 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

Mount Shasta weather stats

Mount Shasta weather statistics
Hottest month: July 28.5°C 83.3°F
Driest month: July 7mm 0.3ins
Sunniest month: July 13.9hrs
Coldest month: January 5.8°C 42.4°F
Wettest month: January 184mm 7.2ins
Map showing location of Mount Shasta (41.30987, -122.31057) Mount Shasta map pin © Google

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