Oroville Weather in September

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

The climate in Oroville during September can be summarized as warm and dry.

September is in the fall / autumn in Oroville and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 31°C (88°F), whilst at night 12°C (53°F) is normal.

Oroville weather averages (imperial / metric)
Daytime temperature 31.1°C 88°F
Nightly temperature 11.9°C 53.4°F
Average temperature 21.5°C 70.7°F
Daily sunshine 12.4 hrs
Avg rainfall 15 mm 0.6 ins
Rainy days 2 days
Sea temperature 14.8°C 58.7°F
Humidity 55%
Windspeed 11.9kph 7 mph

On average September is the 4th driest month of the year in Oroville with around 15mm 0.6 inches of rain making it a dry time to visit. This rainfall is typically spread over 2 days, although this may vary considerably.

On the flip side this corresponds to an average of 12.4 hours of sunshine per day.

September temperatures in Oroville

Oroville average temperature in September

September rainfall

Oroville average rain in September

September hourly sunshine

Oroville 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 Oroville 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

Oroville weather stats

Oroville weather statistics
Hottest month: July 34.3°C 93.7°F
Driest month: July 1mm 0ins
Sunniest month: July 15.1hrs
Coldest month: January 11.5°C 52.7°F
Wettest month: January 171mm 6.7ins
Map showing location of Oroville (39.51378, -121.55636) Oroville map pin © Google

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