Livermore Weather in September

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

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

September is in the fall / autumn in Livermore and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 29°C (84°F), whilst at night 12°C (53°F) is normal.

Livermore weather averages (imperial / metric)
Daytime temperature 28.9°C 83.9°F
Nightly temperature 11.6°C 52.8°F
Average temperature 20.2°C 68.4°F
Daily sunshine 11 hrs
Avg rainfall 7 mm 0.3 ins
Rainy days 2 days
Sea temperature 14.9°C 58.9°F
Humidity 62%
Windspeed 14.8kph 9 mph

On average September is the 4th driest month of the year in Livermore 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 11 hours of sunshine per day.

September temperatures in Livermore

Livermore average temperature in September

September rainfall

Livermore average rain in September

September hourly sunshine

Livermore 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 Livermore 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

Livermore weather stats

Livermore weather statistics
Hottest month: July 30.4°C 86.7°F
Driest month: July 2mm 0.1ins
Sunniest month: July 12.8hrs
Coldest month: January 12.5°C 54.5°F
Wettest month: January 93mm 3.7ins
Map showing location of Livermore (37.68187, -121.76801) Livermore map pin © Google

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