San Mateo Weather in October

What's the weather like in San Mateo (California) in October 2025?

The climate in San Mateo during October can be summarized as mild and dry.

October is in the fall / autumn in San Mateo and is typically the 5th warmest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 11°C (52°F) is normal.

San Mateo weather averages (imperial / metric)
Daytime temperature 22°C 71.5°F
Nightly temperature 11.3°C 52.3°F
Average temperature 16.6°C 61.9°F
Daily sunshine 8.9 hrs
Avg rainfall 25 mm 1 ins
Rainy days 4 days
Sea temperature 14.2°C 57.6°F
Humidity 71%
Windspeed 14.4kph 9 mph

On average October is the 6th driest month of the year in San Mateo with around 25mm 1 inches of rain making it a dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.9 hours of sunshine per day.

October temperatures in San Mateo

San Mateo average temperature in October

October rainfall

San Mateo average rain in October

October hourly sunshine

San Mateo average rain in October

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 Mateo in October 2025.

Other monthly averages

Best places to visit in October

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

San Mateo weather stats

San Mateo weather statistics
Hottest month: September 23.8°C 74.8°F
Driest month: July 1mm 0ins
Sunniest month: April 11.1hrs
Coldest month: January 13.5°C 56.3°F
Wettest month: January 95mm 3.7ins
Map showing location of San Mateo (37.56299, -122.32553) San Mateo map pin © Google

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