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 72.
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
- May 15 to May 16, 2026
- Latest sync
- May 10, 2026 7:59 PM PDT
- Forecast office
- MTR
- Source
- NOAA / NWS
Daily Outlook
This Week in San Mateo County
Saturday looks like the warmest upcoming period in San Mateo County at 75 degrees F.
Friday Night is the coolest period ahead with temperatures near 53 degrees F.
The strongest winds are forecast for Saturday at about 5 to 14 mph WSW.
The forecast from May 15 through May 16 stays mostly dry.
Forecast Details
- Last updated
- May 10, 2026 7:59 PM PDT
- Coverage
- 3 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 53.
Sunny, with a high near 75.
Mostly clear, with a low around 54.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
May 15
|
Mostly Sunny
|
72°F |
5 to 13 mph
WSW
|
|
Friday Night
May 15
|
Mostly Clear
|
53°F |
5 to 13 mph
WSW
|
|
Saturday
May 16
|
Sunny
|
75°F |
5 to 14 mph
WSW
|
|
Saturday Night
May 16
|
Mostly Clear
|
54°F |
5 to 14 mph
WSW
|
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.
