Three Rivers Weather in September

What's the weather like in Three Rivers (California) in September 2025?

The climate in Three Rivers during September can be summarized as warm and very dry.

September is in the fall / autumn in Three Rivers and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 31°C (89°F), whilst at night 13°C (56°F) is normal.

Three Rivers weather averages (imperial / metric)
Daytime temperature 31.4°C 88.5°F
Nightly temperature 13.2°C 55.8°F
Average temperature 22.3°C 72.1°F
Daily sunshine 11.6 hrs
Avg rainfall 9 mm 0.4 ins
Rainy days 2 days
Sea temperature 17°C 62.7°F
Humidity 45%
Windspeed 11.5kph 7 mph

On average September is the 4th driest month of the year in Three Rivers with around 9mm 0.4 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 11.6 hours of sunshine per day.

September temperatures in Three Rivers

Three Rivers average temperature in September

September rainfall

Three Rivers average rain in September

September hourly sunshine

Three Rivers 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 Three Rivers 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

Three Rivers weather stats

Three Rivers weather statistics
Hottest month: July 35.9°C 96.6°F
Driest month: July 1mm 0ins
Sunniest month: July 13.6hrs
Coldest month: December 11.7°C 53.1°F
Wettest month: January 67mm 2.6ins
Map showing location of Three Rivers (36.43884, -118.90454) Three Rivers map pin © Google

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