San Leandro Weather in September

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

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

September is in the fall / autumn in San Leandro and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (77°F), whilst at night 12°C (54°F) is normal.

San Leandro weather averages (imperial / metric)
Daytime temperature 25.2°C 77.4°F
Nightly temperature 12.4°C 54.3°F
Average temperature 18.8°C 65.8°F
Daily sunshine 10.4 hrs
Avg rainfall 7 mm 0.3 ins
Rainy days 2 days
Sea temperature 14.4°C 57.9°F
Humidity 66%
Windspeed 15.8kph 10 mph

On average September is the 4th driest month of the year in San Leandro 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 10.4 hours of sunshine per day.

September temperatures in San Leandro

San Leandro average temperature in September

September rainfall

San Leandro average rain in September

September hourly sunshine

San Leandro 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 Leandro 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 Leandro weather stats

San Leandro weather statistics
Hottest month: August 25°C 77°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.2hrs
Coldest month: January 13°C 55.4°F
Wettest month: January 107mm 4.2ins
Map showing location of San Leandro (37.72493, -122.15608) San Leandro map pin © Google

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