Water Temperature of San Francisco Bay in San Mateo, CA

Current Water Temperature

57.2°F

Measurement Time: Wednesday, March 4, 2020, 11:45 PM PST

Temperature Locations

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Local Points of Interest

San Mateo-Hayward Bridge; Foster City, CA; Burlingame, CA; Hayward, CA

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San Francisco Bay

Station Name: SAN FRANCISCO BAY 2.8 MI N OF SAN MATEO BRIDGE CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
San Francisco Bay
San Mateo, CA 94401
San Mateo County

GPS Coordinates: 37.63078889, -122.2432

Nearby Water Temperatures

Redwood Creek, Redwood City, CA (8.8 mi)
San Francisco Bay, Alameda, CA (10.2 mi)
San Francisco Bay, Menlo Park, CA (11 mi)
San Francisco Bay, San Francisco, CA (14.6 mi)
Coyote Creek, Alviso, CA (16.6 mi)
San Francisco Bay, San Francisco, CA (16.7 mi)
San Francisco Bay, San Francisco, CA (17.2 mi)
Rodeo Pond, Sausalito, CA (20.7 mi)
Rodeo Lagoon, Sausalito, CA (20.8 mi)
Rodeo Lagoon, Sausalito, CA (21 mi)
San Francisco Bay, Richmond, CA (22.3 mi)
Coyote Creek, San Jose, CA (22.5 mi)
San Francisco Bay, San Rafael, CA (23.8 mi)
Arroyo Valle, Livermore, CA (26.5 mi)
Arroyo Hondo, San Jose, CA (28.5 mi)

Weather for San Mateo, California

Current Weather

49.2°F
Clear
Conditions: Clear
Humidity: 73%
Heat Index: 49.2°F
Feels Like: 47.9°F
Wind: NE 1.9 mph
Wind Gusts: 6 mph
Wind Chill: 47.9°F
Air Pressure: 1024.82 millibars
Dew Point: 47.9°F
Chance of Precipitation: 0%
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 10 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Sun
H: 59°F
L: 44°F
Sunny
Mon
H: 60°F
L: 38°F
Sunny
Tue
H: 62°F
L: 38°F
Patchy rain nearby
Wed
H: 57°F
L: 37°F
Moderate rain
Thu
H: 60°F
L: 50°F

Air Quality

AQI: 2 - Moderate
PM2.5: 8.95 μg/m3
PM10: 11.35 μg/m3
Carbon Monoxide: 228.85 μg/m3
Nitrogen Dioxide: 51.55 μg/m3
Sulphur Dioxide: 4.45 μg/m3
Ozone: 14 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:10 AM
Sunset: 4:59 PM
Daylight: 9 hrs 36 mins
Moonrise: 12:17 AM
Moon Transit: 7:04 PM
Moonset: 12:53 AM
Moon Phase: First Quarter
Moon Illumination: 63.0%

Best Times for Fishing or Hunting

Major Periods

1:42 AM - 4:12 AM
6:34 PM - 9:04 PM

Minor Periods

11:47 AM - 1:17 PM
12:23 AM - 1:53 AM

Action Rating: 2 out of 5

Cold Weather Advisory issued December 28 at 11:13AM PST until December 29 at 9:00AM PST by NWS San Francisco CA

Effective: Sun December 28, 2025, 11:13 AM
Expires: Mon December 29, 2025, 9:00 AM

* WHAT...Cold conditions with temperatures as low as 34 expected. * WHERE...Interior Central Coast, The Santa Clara Valley and Eastern Hills, The East Bay Hills and Valleys, and North Bay Interior Valleys. * WHEN...From 1 AM to 9 AM PST Monday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken.

Ensure portable heaters are working properly and are used correctly to avoid sparking a fire indoors. Do not use generators or grills inside as carbon monoxide poisoning can result. Check with your local, city, or county officials for information on available warming centers. Be sure to dress in layers if outdoors. Make sure that pets and livestock have adequate food, unfrozen water, and warmth. Cover or tend to sensitive crops, plants, and vegetation.
Sunday, December 28, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 49.3°F
Average Humidity: 73%
Chance of Rain: 0%
Wind: 8.5 mph
UV Index: 0.4

Air Quality

AQI: 2 - Moderate
PM2.5: 18.18 μg/m3
PM10: 19.39 μg/m3
Carbon Monoxide: 275.41 μg/m3
Nitrogen Dioxide: 43.86 μg/m3
Sulphur Dioxide: 7.02 μg/m3
Ozone: 21.32 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:10 AM
Sunset: 4:59 PM
Daylight: 9 hrs 36 mins
Moonrise: 12:17 AM
Moon Transit: 7:04 PM
Moonset: 12:53 AM
Moon Phase: First Quarter
Moon Illumination: 63.0%

Best Times for Fishing or Hunting

Major Periods

1:42 AM - 4:12 AM
6:34 PM - 9:04 PM

Minor Periods

11:47 AM - 1:17 PM
12:23 AM - 1:53 AM

Action Rating: 2 out of 5

Monday, December 29, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 48.2°F
Average Humidity: 68%
Chance of Rain: 0%
Wind: 5.8 mph
UV Index: 0.4

Air Quality

AQI: 2 - Moderate
PM2.5: 16.45 μg/m3
PM10: 18.74 μg/m3
Carbon Monoxide: 306.61 μg/m3
Nitrogen Dioxide: 47.45 μg/m3
Sulphur Dioxide: 6.39 μg/m3
Ozone: 20.24 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:11 AM
Sunset: 4:59 PM
Daylight: 9 hrs 36 mins
Moonrise: 12:47 AM
Moon Transit: 7:56 PM
Moonset: 2:04 AM
Moon Phase: First Quarter
Moon Illumination: 73.5%

Best Times for Fishing or Hunting

Major Periods

2:32 AM - 5:02 AM
7:26 PM - 9:56 PM

Minor Periods

12:17 AM - 1:47 PM
1:34 AM - 3:04 AM

Action Rating: 2 out of 5

Tuesday, December 30, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 48.1°F
Average Humidity: 80%
Chance of Rain: 0%
Wind: 5.8 mph
UV Index: 0.4

Air Quality

AQI: 2 - Moderate
PM2.5: 18.54 μg/m3
PM10: 20.88 μg/m3
Carbon Monoxide: 404.13 μg/m3
Nitrogen Dioxide: 49.19 μg/m3
Sulphur Dioxide: 6.15 μg/m3
Ozone: 10.44 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:11 AM
Sunset: 5:00 PM
Daylight: 9 hrs 36 mins
Moonrise: 1:23 PM
Moon Transit: 8:54 PM
Moonset: 3:19 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%

Best Times for Fishing or Hunting

Major Periods

3:26 AM - 5:56 AM
8:24 PM - 10:54 PM

Minor Periods

12:53 AM - 2:23 PM
2:49 AM - 4:19 AM

Action Rating: 2 out of 5

Wednesday, December 31, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 45.8°F
Average Humidity: 86%
Chance of Rain: 70%
Wind: 5.8 mph
UV Index: 0.4

Air Quality

AQI: 2 - Moderate
PM2.5: 20.18 μg/m3
PM10: 22.07 μg/m3
Carbon Monoxide: 355.46 μg/m3
Nitrogen Dioxide: 45.38 μg/m3
Sulphur Dioxide: 5.79 μg/m3
Ozone: 8.92 μg/m3

Astronomical

Sunrise: 7:24 AM
Sun Transit: 12:12 AM
Sunset: 5:01 PM
Daylight: 9 hrs 37 mins
Moonrise: 2:09 PM
Moon Transit: 9:57 PM
Moonset: 4:37 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%

Best Times for Fishing or Hunting

Major Periods

4:26 AM - 6:56 AM
9:27 PM - 11:57 PM

Minor Periods

1:39 PM - 3:09 PM
4:07 AM - 5:37 AM

Action Rating: 3 out of 5

Thursday, January 1, 2026

Weather Forecast

Conditions: Moderate rain
Average Temperature: 54.1°F
Average Humidity: 87%
Chance of Rain: 87%
Wind: 6.7 mph
UV Index: 0

Air Quality

AQI: 2 - Moderate
PM2.5: 24.56 μg/m3
PM10: 27.26 μg/m3
Carbon Monoxide: 475.29 μg/m3
Nitrogen Dioxide: 39.04 μg/m3
Sulphur Dioxide: 6.31 μg/m3
Ozone: 21.69 μg/m3

Astronomical

Sunrise: 7:24 AM
Sun Transit: 12:12 AM
Sunset: 5:01 PM
Daylight: 9 hrs 38 mins
Moonrise: 3:06 PM
Moon Transit: 11:03 PM
Moonset: 5:53 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 96.0%

Best Times for Fishing or Hunting

Major Periods

5:30 AM - 8:00 AM
12:00 AM - 12:00 AM

Minor Periods

2:36 PM - 4:06 PM
5:23 AM - 6:53 AM

Action Rating: 2 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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