San Rafael Weather in September

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

The climate in San Rafael during September can be summarized as mild and dry.

September is in the fall / autumn in San Rafael and is typically the warmest month of the year. Daytime maximum temperatures average around a comfortable 23°C (73°F), whilst at night 11°C (52°F) is normal.

San Rafael weather averages (imperial / metric)
Daytime temperature 22.9°C 73.1°F
Nightly temperature 11.4°C 52.4°F
Average temperature 17.1°C 62.8°F
Daily sunshine 10 hrs
Avg rainfall 11 mm 0.4 ins
Rainy days 2 days
Sea temperature 14.4°C 57.9°F
Humidity 70%
Windspeed 16.2kph 10 mph

On average September is the 4th driest month of the year in San Rafael with around 11mm 0.4 inches of rain making it a dry time to visit. This rainfall is typically spread over 2 days, although this may vary considerably.

On the flip side this corresponds to an average of 10 hours of sunshine per day.

September temperatures in San Rafael

San Rafael average temperature in September

September rainfall

San Rafael average rain in September

September hourly sunshine

San Rafael 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 San Rafael 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

San Rafael weather stats

San Rafael weather statistics
Hottest month: September 22.6°C 72.7°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11hrs
Coldest month: January 13.2°C 55.8°F
Wettest month: January 208mm 8.2ins
Map showing location of San Rafael (37.97353, -122.53109) San Rafael map pin © Google

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