Campbell Weather in September

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

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

September is in the fall / autumn in Campbell and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (80°F), whilst at night 12°C (53°F) is normal.

Campbell weather averages (imperial / metric)
Daytime temperature 26.5°C 79.7°F
Nightly temperature 11.7°C 53.1°F
Average temperature 19.1°C 66.4°F
Daily sunshine 10.4 hrs
Avg rainfall 7 mm 0.3 ins
Rainy days 2 days
Sea temperature 14.9°C 58.9°F
Humidity 67%
Windspeed 15.1kph 9 mph

On average September is the 5th driest month of the year in Campbell with around 7mm 0.3 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10.4 hours of sunshine per day.

September temperatures in Campbell

Campbell average temperature in September

September rainfall

Campbell average rain in September

September hourly sunshine

Campbell 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 Campbell 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

Campbell weather stats

Campbell weather statistics
Hottest month: August 26.8°C 80.2°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.2hrs
Coldest month: December 13.6°C 56.5°F
Wettest month: January 115mm 4.5ins
Map showing location of Campbell (37.28717, -121.94996) Campbell map pin © Google

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