Watsonville Weather in September

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

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

September is in the fall / autumn in Watsonville and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 26°C (78°F), whilst at night 11°C (51°F) is normal.

Watsonville weather averages (imperial / metric)
Daytime temperature 25.7°C 78.3°F
Nightly temperature 10.5°C 50.9°F
Average temperature 18.1°C 64.6°F
Daily sunshine 10.4 hrs
Avg rainfall 9 mm 0.4 ins
Rainy days 1 days
Sea temperature 15.8°C 60.4°F
Humidity 67%
Windspeed 14.4kph 9 mph

On average September is the 5th driest month of the year in Watsonville 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 10.4 hours of sunshine per day.

September temperatures in Watsonville

Watsonville average temperature in September

September rainfall

Watsonville average rain in September

September hourly sunshine

Watsonville 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 Watsonville 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

Watsonville weather stats

Watsonville weather statistics
Hottest month: August 25.7°C 78.3°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.3hrs
Coldest month: December 14.2°C 57.6°F
Wettest month: January 108mm 4.3ins
Map showing location of Watsonville (36.91023, -121.75689) Watsonville map pin © Google

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