Modesto Weather in September

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

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

September is in the fall / autumn in Modesto and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 31°C (88°F), whilst at night 13°C (55°F) is normal.

Modesto weather averages (imperial / metric)
Daytime temperature 31°C 87.8°F
Nightly temperature 12.6°C 54.7°F
Average temperature 21.8°C 71.2°F
Daily sunshine 11.9 hrs
Avg rainfall 6 mm 0.2 ins
Rainy days 1 days
Sea temperature 16°C 60.7°F
Humidity 54%
Windspeed 13kph 8 mph

On average September is the 5th driest month of the year in Modesto with around 6mm 0.2 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 11.9 hours of sunshine per day.

September temperatures in Modesto

Modesto average temperature in September

September rainfall

Modesto average rain in September

September hourly sunshine

Modesto 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 Modesto 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

Modesto weather stats

Modesto weather statistics
Hottest month: July 33.9°C 93°F
Driest month: July 1mm 0ins
Sunniest month: July 14.2hrs
Coldest month: December 12.1°C 53.8°F
Wettest month: January 58mm 2.3ins
Map showing location of Modesto (37.6391, -120.99688) Modesto map pin © Google

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