Montalvin Weather in September

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

The climate in Montalvin during September can be summarized as mild and very dry.

September is in the fall / autumn in Montalvin and is typically the warmest month of the year. Daytime maximum temperatures average around a comfortable 23°C (74°F), whilst at night 13°C (55°F) is normal.

Montalvin weather averages (imperial / metric)
Daytime temperature 23.1°C 73.6°F
Nightly temperature 12.7°C 54.9°F
Average temperature 17.9°C 64.2°F
Daily sunshine 10.3 hrs
Avg rainfall 10 mm 0.4 ins
Rainy days 2 days
Sea temperature 14.4°C 57.9°F
Humidity 67%
Windspeed 15.8kph 10 mph

On average September is the 4th driest month of the year in Montalvin with around 10mm 0.4 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10.3 hours of sunshine per day.

September temperatures in Montalvin

Montalvin average temperature in September

September rainfall

Montalvin average rain in September

September hourly sunshine

Montalvin 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 Montalvin 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

Montalvin weather stats

Montalvin weather statistics
Hottest month: September 22.9°C 73.2°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.2hrs
Coldest month: January 13.2°C 55.8°F
Wettest month: January 143mm 5.6ins
Map showing location of Montalvin (37.99548, -122.33275) Montalvin map pin © Google

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