Weather · December
San Mateo weather in December
Average highs of 58°F, lows of 45°F and 4.1 in of rain, from 30 years of weather records.
December is San Mateo’s 11th warmest month, with average highs of 58°F and lows of 45°F. That is 6° cooler than November, and 9° below the yearly average high.
- Average high
- 58°F
- Average low
- 45°F
- Precipitation
- 4.1 in
- Wet days
- 11
- Sunrise · sunset
- 7:16 AM · 4:52 PM
What to wear in December
- 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 December weather is good for
What’s on in San Mateo in December
Guides for this month: Christmas in San Mateo · New Year’s Eve in San Mateo.
- Caltrain Holiday TrainSaturday, December 5 · San Mateo Caltrain Station, Downtown San Mateo
- Holiday Wreath Workshop at the San Mateo ArboretumDecember 5 – December 6 · 11 a.m.-1 p.m. each day · San Mateo Arboretum Society Pumphouse and Nursery, Central Park
- Las Posadas on North B StreetSaturday, December 5 · 5:30-7 p.m. · North B Street between Tilton and Baldwin Avenues, San Mateo
- Santa Arrives by Helicopter at Hiller Aviation MuseumSaturday, December 5 · Doors 9:30 a.m.; Santa lands 10:30 a.m. · Hiller Aviation Museum, San Carlos (about 10 minutes from San Mateo)
- Santa MateoSaturday, December 5 · 5-10 p.m. · Downtown San Mateo
- Winter WonderlandSaturday, December 5 · 5-7 p.m. · Central Park and the Central Recreation Center, San Mateo
- HEAD WEST Marketplace holiday editionSaturday, December 19 · 11 a.m.-4 p.m. · B Street between 1st and 3rd Avenues, Downtown San Mateo
- Rejoice! Rejoice! Christmas concert with Desmond PringleSaturday, December 19 · 3-5 p.m. · Oak Room, San Mateo Main Library
- The Nutcracker - Peninsula Ballet ArtsDecember 19 – December 20 · San Mateo Performing Arts Center, San Mateo
- Noon Year's Eve at Hiller Aviation MuseumThursday, December 31 · 10 a.m.-1 p.m.; balloon drops at noon · Hiller Aviation Museum, San Carlos (about 10 minutes from San Mateo)
See all upcoming events and school days off.
December 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 December?
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 December?
December averages 4.1 in of precipitation over about 11 days with at least 0.01 in. It is the wettest month of the year.
What time is sunset in San Mateo in December?
Around mid-December the sun rises about 7:16 AM and sets about 4:52 PM, for roughly 9.6 hours of daylight.
Is December a good time to visit San Mateo?
The mildest months for visiting are June, July, August. December is cool, with Christmas lights and New Year’s Eve events.
NOAA U.S. Climate Normals 1991–2020, San Francisco Intl Ap station (5.3 mi from downtown). Sunrise and sunset are calculated for December 15 at the city’s coordinates.