Hollister Weather in September

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

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

September is in the fall / autumn in Hollister and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (81°F), whilst at night 11°C (51°F) is normal.

Hollister weather averages (imperial / metric)
Daytime temperature 27°C 80.5°F
Nightly temperature 10.7°C 51.2°F
Average temperature 18.8°C 65.8°F
Daily sunshine 10.7 hrs
Avg rainfall 6 mm 0.3 ins
Rainy days 1 days
Sea temperature 15.8°C 60.4°F
Humidity 64%
Windspeed 13.7kph 9 mph

On average September is the 5th driest month of the year in Hollister with around 6mm 0.3 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10.7 hours of sunshine per day.

September temperatures in Hollister

Hollister average temperature in September

September rainfall

Hollister average rain in September

September hourly sunshine

Hollister 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 Hollister 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

Hollister weather stats

Hollister weather statistics
Hottest month: August 27.4°C 81.3°F
Driest month: July 1mm 0ins
Sunniest month: April 11.4hrs
Coldest month: December 13.3°C 55.9°F
Wettest month: January 75mm 3ins
Map showing location of Hollister (36.85245, -121.4016) Hollister map pin © Google

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