Hourly Weather Forecast - San Mateo, CA

12 AM
49°F
90%
9mph
S
Rain
Humidity
92%
Feels like
45°F
Dew Point
47°F
1 AM
49°F
90%
9mph
S
Rain
Humidity
92%
Feels like
44°F
Dew Point
46°F
2 AM
48°F
80%
9mph
S
80% Chance of Light Rain
Humidity
92%
Feels like
44°F
Dew Point
46°F
3 AM
48°F
80%
9mph
S
80% Chance Rain Showers
Humidity
93%
Feels like
44°F
Dew Point
46°F
4 AM
48°F
70%
8mph
S
70% Chance Rain Showers
Humidity
92%
Feels like
44°F
Dew Point
46°F
5 AM
48°F
70%
8mph
S
70% Chance Rain Showers
Humidity
93%
Feels like
44°F
Dew Point
46°F
6 AM
48°F
70%
8mph
S
70% Chance Rain Showers
Humidity
92%
Feels like
45°F
Dew Point
46°F
7 AM
49°F
60%
7mph
SSE
60% Chance Rain Showers
Humidity
90%
Feels like
46°F
Dew Point
46°F
7:22 AM
8 AM
49°F
60%
7mph
SSE
60% Chance Rain Showers
Humidity
90%
Feels like
46°F
Dew Point
47°F
9 AM
50°F
60%
7mph
S
60% Chance Rain Showers
Humidity
90%
Feels like
50°F
Dew Point
47°F
10 AM
51°F
60%
8mph
S
60% Chance Rain Showers
Humidity
90%
Feels like
51°F
Dew Point
48°F
11 AM
51°F
70%
8mph
S
70% Chance Rain Showers
Humidity
88%
Feels like
51°F
Dew Point
48°F
12 PM
52°F
70%
8mph
S
70% Chance Rain Showers
Humidity
87%
Feels like
52°F
Dew Point
48°F
1 PM
52°F
70%
8mph
S
70% Chance Rain Showers
Humidity
85%
Feels like
52°F
Dew Point
47°F
2 PM
52°F
70%
7mph
S
70% Chance Rain Showers
Humidity
85%
Feels like
52°F
Dew Point
47°F

Rain And Snow Totals Through Monday

Atmospheric River Takes Aim For Northern California

The plume of abundant moisture impacting the Northwest the last several days will focus more on Northern California later today into Monday bringing heavy rainfall and mountain snow.

NOAA, NCDC

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Sunday's Weather Outlook

Sunday's Weather Outlook

Cold weather

During Extreme Cold: Watch for Frostbite!

Flu Update Valid For Week Ending December 13, 2025

Weekly Flu Update: Flu Spreading Hard Across U.S.

Watch vs. Warning

Flash Flood Watch and Warning Defined

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