San Mateo County, CA Weather Forecast
County weather hub
Mostly Sunny
Compare major city weather across San Mateo County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly sunny. High near 67, with temperatures falling to around 65 in the afternoon. Southwest wind 6 to 9 mph.
County Weather Overview
This county weather page brings together forecast coverage for San Mateo County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 12 of 16 mapped cities in San Mateo County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Apr 9 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 12:07 PM PDT
- Forecast office
- MTR
- Source
- NOAA / NWS
Daily Outlook
This Week in San Mateo County
This Afternoon looks like the warmest upcoming period in San Mateo County at 67 degrees F.
Sunday Night is the coolest period ahead with temperatures near 48 degrees F.
The strongest winds are forecast for Saturday at about 8 to 16 mph SSW.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 12:07 PM PDT
- Coverage
- 8 days
- Time zone
- America/Los_Angeles
- Forecast office
- MTR
- Radar station
- KMUX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of rain showers after midnight. Mostly cloudy, with a low around 55. Southwest wind 5 to 8 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers before 8am, then showers and thunderstorms. Mostly cloudy. High near 65, with temperatures falling to around 62 in the afternoon. South southwest wind 5 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
Showers and thunderstorms likely. Mostly cloudy, with a low around 54. South southwest wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Rain showers before 2pm, then showers and thunderstorms. Cloudy, with a high near 62. South southwest wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and thunderstorms. Cloudy, with a low around 50. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Rain showers before 11am, then showers and thunderstorms between 11am and 5pm, then a chance of rain. Mostly cloudy, with a high near 59.
A chance of rain before 5am. Partly cloudy, with a low around 48.
Sunny, with a high near 64.
Mostly clear, with a low around 49.
Sunny, with a high near 65.
Mostly clear, with a low around 49.
Mostly sunny, with a high near 67.
Partly cloudy, with a low around 51.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Apr 9
|
Mostly Sunny
|
67°F |
6 to 9 mph
SW
|
|
Tonight
Apr 9
|
Mostly Cloudy then Chance Rain Showers
|
55°F |
5 to 8 mph
SW
|
|
Friday
Apr 10
|
Showers And Thunderstorms
|
65°F |
5 to 10 mph
SSW
|
|
Friday Night
Apr 10
|
Showers And Thunderstorms Likely
|
54°F |
10 mph
SSW
|
|
Saturday
Apr 11
|
Rain Showers
|
62°F |
8 to 16 mph
SSW
|
|
Saturday Night
Apr 11
|
Showers And Thunderstorms
|
50°F |
9 to 14 mph
SSW
|
|
Sunday
Apr 12
|
Showers And Thunderstorms
|
59°F |
12 mph
SW
|
|
Sunday Night
Apr 12
|
Chance Light Rain
|
48°F |
5 to 12 mph
W
|
|
Monday
Apr 13
|
Sunny
|
64°F |
5 to 12 mph
NNW
|
|
Monday Night
Apr 13
|
Mostly Clear
|
49°F |
7 to 12 mph
W
|
|
Tuesday
Apr 14
|
Sunny
|
65°F |
6 to 10 mph
W
|
|
Tuesday Night
Apr 14
|
Mostly Clear
|
49°F |
6 to 10 mph
W
|
|
Wednesday
Apr 15
|
Mostly Sunny
|
67°F |
5 to 12 mph
WSW
|
|
Wednesday Night
Apr 15
|
Partly Cloudy
|
51°F |
6 to 12 mph
W
|
Major City Forecasts
Live forecast snapshots for major cities across San Mateo County.
Coverage
Forecast coverage currently spans 12 of 16 mapped cities in San Mateo County.
Largest mapped city population in this region: 106,280.
