Water Temperature of San Francisco Bay in San Francisco, CA

Current Water Temperature

54.5°F

Measurement Time: Wednesday, December 31, 2025, 5:00 AM PST

Temperature Locations

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Local Points of Interest

Alcatraz Island

San Francisco Bay

Station Name: SAN FRANCISCO BAY A NE SHORE ALCATRAZ ISLAND CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
Alcatraz Island
San Francisco, CA 94133-1312
San Francisco County

GPS Coordinates: 37.8272222, -122.4216667

Nearby Water Temperatures

San Francisco Bay, San Francisco, CA (2.1 mi)
San Francisco Bay, San Francisco, CA (2.8 mi)
Rodeo Pond, Sausalito, CA (5.6 mi)
Rodeo Lagoon, Sausalito, CA (5.8 mi)
Rodeo Lagoon, Sausalito, CA (6.1 mi)
San Francisco Bay, Richmond, CA (7.1 mi)
San Francisco Bay, San Rafael, CA (7.6 mi)
San Francisco Bay, Alameda, CA (7.7 mi)
San Francisco Bay, San Mateo, CA (16.7 mi)
Carquinez Strait, Martinez, CA (21.6 mi)
Pacific Ocean, San Francisco, CA (23.3 mi)
Redwood Creek, Redwood City, CA (25 mi)
Suisun Bay, Concord, CA (26.1 mi)
San Francisco Bay, Menlo Park, CA (27.7 mi)
Drakes Bay, Inverness, CA (32.2 mi)

Weather for San Francisco, California

Current Weather

52°F
Light rain
Light rain
50.5°F
55.9°F
86%
NNE 5.1 mph
8 mph
54.8°F
50.7°F
0.01 in
100%
6 mi
1016 mbar
0.2

Five Day Weather Forecast

Heavy rain
Wed
H: 57°F
L: 46°F
Moderate rain
Thu
H: 55°F
L: 51°F
Moderate rain
Fri
H: 57°F
L: 55°F
Patchy rain nearby
Sat
H: 56°F
L: 53°F
Moderate rain
Sun
H: 52°F
L: 51°F

Air Quality

AQI: 1 - Good
PM2.5: 20.65 μg/m3
PM10: 20.85 μg/m3
Carbon Monoxide: 385.85 μg/m3
Nitrogen Dioxide: 52.05 μg/m3
Sulphur Dioxide: 5.95 μg/m3
Ozone: 1 μg/m3

Astronomical

Sunrise: 7:25 AM
Sun Transit: 12:12 AM
Sunset: 5:01 PM
Daylight: 9 hrs 36 mins
Moonrise: 2:09 PM
Moon Transit: 9:58 PM
Moonset: 4:38 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%

Best Times for Fishing or Hunting

Major Periods

4:25 AM - 6:55 AM
9:28 PM - 11:58 PM

Minor Periods

1:39 PM - 3:09 PM
4:08 AM - 5:38 AM

Action Rating: 3 out of 5

Coastal Flood Advisory issued December 31 at 12:27AM PST until January 4 at 2:00PM PST by NWS San Francisco CA

Effective: Wed December 31, 2025, 12:27 AM
Expires: Wed December 31, 2025, 2:00 PM

* WHAT...Up to 2.2 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...San Francisco Bay and San Pablo Bay shoreline, Monterey Bay shoreline, and the Pacific Coast. * WHEN...From 5 AM Wednesday to 2 PM PST Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be: 1.5 ft above normal (7.3 ft MLLW) at 7:51 AM Wednesday 12/31 2.0 ft above normal (7.8 ft MLLW) at 8:41 AM Thursday 1/1 2.2 ft above normal (8.0 ft MLLW) at 9:34 AM Friday 1/2 2.2 ft above normal (8.0 ft MLLW) at 10:26 AM Saturday 1/3 1.8 ft above normal (7.6 ft MLLW) at 11:18 AM Sunday 1/4 These predictions include up to 1.0 feet of storm surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.


Dense Fog Advisory issued December 30 at 11:56PM PST until December 31 at 11:00AM PST by NWS Sacramento CA

Effective: Tue December 30, 2025, 11:56 PM
Expires: Wed December 31, 2025, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Central Sacramento Valley and Southern Sacramento Valley. * WHEN...Until 11 AM PST Wednesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Wednesday, December 31, 2025

Weather Forecast

Heavy rain
57.4°F
45.9°F
49.6°F
84%
1.27 in
90%
0%
8.5 mph
0.1


Air Quality

AQI: 2 - Moderate
PM2.5: 17.88 μg/m3
PM10: 22.65 μg/m3
Carbon Monoxide: 353.29 μg/m3
Nitrogen Dioxide: 50.75 μg/m3
Sulphur Dioxide: 6.47 μg/m3
Ozone: 3.36 μg/m3

Astronomical

Sunrise: 7:25 AM
Sun Transit: 12:12 AM
Sunset: 5:01 PM
Daylight: 9 hrs 36 mins
Moonrise: 2:09 PM
Moon Transit: 9:58 PM
Moonset: 4:38 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%

Best Times for Fishing or Hunting

Major Periods

4:25 AM - 6:55 AM
9:28 PM - 11:58 PM

Minor Periods

1:39 PM - 3:09 PM
4:08 AM - 5:38 AM

Action Rating: 3 out of 5

Thursday, January 1, 2026

Weather Forecast

Moderate rain
54.9°F
50.9°F
52.8°F
96%
0.33 in
86%
0%
9.2 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 14.67 μg/m3
PM10: 15.08 μg/m3
Carbon Monoxide: 345.89 μg/m3
Nitrogen Dioxide: 33.5 μg/m3
Sulphur Dioxide: 4.33 μg/m3
Ozone: 21.72 μg/m3

Astronomical

Sunrise: 7:25 AM
Sun Transit: 12:13 AM
Sunset: 5:02 PM
Daylight: 9 hrs 37 mins
Moonrise: 3:06 PM
Moon Transit: 11:04 PM
Moonset: 5:54 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
5:24 AM - 6:54 AM

Action Rating: 2 out of 5

Friday, January 2, 2026

Weather Forecast

Moderate rain
56.7°F
54.8°F
55.8°F
89%
0.43 in
80%
0%
28.6 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 8.31 μg/m3
PM10: 11.95 μg/m3
Carbon Monoxide: 219.17 μg/m3
Nitrogen Dioxide: 11.07 μg/m3
Sulphur Dioxide: 2.19 μg/m3
Ozone: 67.52 μg/m3

Astronomical

Sunrise: 7:25 AM
Sun Transit: 12:13 AM
Sunset: 5:02 PM
Daylight: 9 hrs 37 mins
Moonrise: 4:15 PM
Moon Transit: 12:00 AM
Moonset: 7:03 AM
Moon Phase: Full
Moon Illumination: 99.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
6:36 AM - 9:06 AM

Minor Periods

3:45 PM - 5:15 PM
6:33 AM - 8:03 AM

Action Rating: 4 out of 5

Saturday, January 3, 2026

Weather Forecast

Patchy rain nearby
56°F
52.9°F
54°F
78%
0.12 in
77%
0%
19 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 7.52 μg/m3
PM10: 12.66 μg/m3
Carbon Monoxide: 151.99 μg/m3
Nitrogen Dioxide: 5.04 μg/m3
Sulphur Dioxide: 1.78 μg/m3
Ozone: 91.28 μg/m3

Astronomical

Sunrise: 7:25 AM
Sun Transit: 12:14 AM
Sunset: 5:03 PM
Daylight: 9 hrs 38 mins
Moonrise: 5:29 PM
Moon Transit: 12:11 AM
Moonset: 8:01 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:42 AM - 10:12 AM

Minor Periods

4:59 PM - 6:29 PM
7:31 AM - 9:01 AM

Action Rating: 6 out of 5

Sunday, January 4, 2026

Weather Forecast

Moderate rain
51.7°F
50.7°F
51.9°F
88%
0.49 in
78%
0%
8.1 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 9.56 μg/m3
PM10: 12.94 μg/m3
Carbon Monoxide: 191.53 μg/m3
Nitrogen Dioxide: 18.29 μg/m3
Sulphur Dioxide: 2.97 μg/m3
Ozone: 71.23 μg/m3

Astronomical

Sunrise: 7:25 AM
Sun Transit: 12:14 AM
Sunset: 5:04 PM
Daylight: 9 hrs 39 mins
Moonrise: 6:46 PM
Moon Transit: 1:13 AM
Moonset: 8:48 AM
Moon Phase: Full
Moon Illumination: 98.1%

Best Times for Fishing or Hunting

Major Periods

12:43 AM - 3:13 AM
8:43 AM - 11:13 AM

Minor Periods

6:16 PM - 7:46 PM
8:18 AM - 9:48 AM

Action Rating: 3 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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