Antioch Weather in September

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

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

September is in the fall / autumn in Antioch and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 30°C (86°F), whilst at night 13°C (55°F) is normal.

Antioch weather averages (imperial / metric)
Daytime temperature 30.1°C 86.1°F
Nightly temperature 12.6°C 54.6°F
Average temperature 21.3°C 70.3°F
Daily sunshine 11.5 hrs
Avg rainfall 5 mm 0.2 ins
Rainy days 2 days
Sea temperature 15°C 58.9°F
Humidity 60%
Windspeed 14.4kph 9 mph

On average September is the 4th driest month of the year in Antioch with around 5mm 0.2 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 11.5 hours of sunshine per day.

September temperatures in Antioch

Antioch average temperature in September

September rainfall

Antioch average rain in September

September hourly sunshine

Antioch 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 Antioch 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

Antioch weather stats

Antioch weather statistics
Hottest month: July 31.9°C 89.4°F
Driest month: July 1mm 0ins
Sunniest month: July 13.6hrs
Coldest month: January 11.9°C 53.4°F
Wettest month: January 84mm 3.3ins
Map showing location of Antioch (38.00492, -121.80579) Antioch map pin © Google

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