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, with a high near 76. South southwest wind 8 to 12 mph, with gusts as high as 18 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
- Jul 15 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 12:05 AM PDT
- Forecast office
- MTR
- Source
- NOAA / NWS
Daily Outlook
This Week in San Mateo County
Wednesday looks like the warmest upcoming period in San Mateo County at 76 degrees F.
Friday Night is the coolest period ahead with temperatures near 54 degrees F.
The strongest winds are forecast for Friday at about 9 to 14 mph SW.
The forecast from Jul 15 through Jul 20 stays mostly dry.
Forecast Details
- Last updated
- Jul 14, 2026 12:05 AM PDT
- Coverage
- 6 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
Mostly clear, with a low around 58. Southwest wind 8 to 12 mph, with gusts as high as 18 mph.
Sunny, with a high near 70.
Mostly clear, with a low around 55.
Mostly sunny, with a high near 65.
Partly cloudy, with a low around 54.
Mostly sunny, with a high near 66.
Partly cloudy, with a low around 55.
Partly sunny, with a high near 67.
Mostly cloudy, with a low around 56.
Partly sunny, with a high near 68.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jul 15
|
Mostly Sunny
|
76°F |
8 to 12 mph
SSW
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
58°F |
8 to 12 mph
SW
|
|
Thursday
Jul 16
|
Sunny
|
70°F |
8 to 13 mph
SW
|
|
Thursday Night
Jul 16
|
Mostly Clear
|
55°F |
9 to 13 mph
SW
|
|
Friday
Jul 17
|
Mostly Sunny
|
65°F |
9 to 14 mph
SW
|
|
Friday Night
Jul 17
|
Partly Cloudy
|
54°F |
8 to 12 mph
SW
|
|
Saturday
Jul 18
|
Mostly Sunny
|
66°F |
8 to 12 mph
SW
|
|
Saturday Night
Jul 18
|
Partly Cloudy
|
55°F |
7 to 10 mph
SW
|
|
Sunday
Jul 19
|
Partly Sunny
|
67°F |
7 to 12 mph
SW
|
|
Sunday Night
Jul 19
|
Mostly Cloudy
|
56°F |
7 to 10 mph
SW
|
|
Monday
Jul 20
|
Partly Sunny
|
68°F |
7 to 12 mph
SW
|
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.
