Twain Harte Weather in September

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

The climate in Twain Harte during September can be summarized as warm and dry.

September is in the fall / autumn in Twain Harte and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (81°F), whilst at night 9°C (49°F) is normal.

Twain Harte weather averages (imperial / metric)
Daytime temperature 27.2°C 80.9°F
Nightly temperature 9.3°C 48.7°F
Average temperature 18.2°C 64.8°F
Daily sunshine 11.9 hrs
Avg rainfall 17 mm 0.7 ins
Rainy days 3 days
Sea temperature 15.6°C 60.2°F
Humidity 50%
Windspeed 11.9kph 7 mph

On average September is the 4th driest month of the year in Twain Harte with around 17mm 0.7 inches of rain making it a dry time to visit. This rainfall is typically spread over 3 days, although this may vary considerably.

On the flip side this corresponds to an average of 11.9 hours of sunshine per day.

September temperatures in Twain Harte

Twain Harte average temperature in September

September rainfall

Twain Harte average rain in September

September hourly sunshine

Twain Harte 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 Twain Harte 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

Twain Harte weather stats

Twain Harte weather statistics
Hottest month: July 30.6°C 87.1°F
Driest month: July 4mm 0.2ins
Sunniest month: July 14.2hrs
Coldest month: December 8.9°C 48°F
Wettest month: January 176mm 6.9ins
Map showing location of Twain Harte (38.03965, -120.23269) Twain Harte map pin © Google

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