Weather · January
San Mateo weather in January
Average highs of 58°F, lows of 45°F and 3.9 in of rain, from 30 years of weather records.
January is San Mateo’s coldest month, with average highs of 58°F and lows of 45°F. That is about the same as December, and 9° below the yearly average high.
- Average high
- 58°F
- Average low
- 45°F
- Precipitation
- 3.9 in
- Wet days
- 11
- Sunrise · sunset
- 7:22 AM · 5:13 PM
What to wear in January
- Cool days: a warm jacket and long pants, plus layers for the swing between morning and afternoon.
- Pack an umbrella or rain jacket: rain or snow falls on about 11 days this month.
What January weather is good for
January compared with the months around it
Planning a trip? See the best time to visit San Mateo and today’s forecast.
Questions
How hot does it get in San Mateo in January?
Average highs are 58°F and average lows 45°F, for a daily mean of 51°F. Individual days run hotter or colder than these 30-year averages.
Does it rain in San Mateo in January?
January averages 3.9 in of precipitation over about 11 days with at least 0.01 in. It is the 3rd wettest month of the year.
What time is sunset in San Mateo in January?
Around mid-January the sun rises about 7:22 AM and sets about 5:13 PM, for roughly 9.9 hours of daylight.
Is January a good time to visit San Mateo?
The mildest months for visiting are June, July, August. January is cool.
NOAA U.S. Climate Normals 1991–2020, San Francisco Intl Ap station (5.3 mi from downtown). Sunrise and sunset are calculated for January 15 at the city’s coordinates.