Water Temperature of San Francisco Bay in San Francisco, CA

Current Water Temperature

55.2°F

Measurement Time: Saturday, January 17, 2026, 12:00 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

46.9°F
Partly cloudy
Partly cloudy
43.5°F
52°F
93%
NE 6.9 mph
14 mph
49.5°F
44.7°F
0 in
75%
9 mi
1021 mbar
0.2

Five Day Weather Forecast

Sunny
Sat
H: 59°F
L: 51°F
Sunny
Sun
H: 61°F
L: 53°F
Sunny
Mon
H: 61°F
L: 53°F
Overcast
Tue
H: 60°F
L: 52°F
Cloudy
Wed
H: 57°F
L: 54°F

Air Quality

PM2.5: 22.35 μg/m3
PM10: 26.85 μg/m3
Carbon Monoxide: 275.85 μg/m3
Nitrogen Dioxide: 41.15 μg/m3
Sulphur Dioxide: 8.35 μg/m3
Ozone: 24 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:19 AM
Sunset: 5:17 PM
Daylight: 9 hrs 54 mins
Moonrise: 6:57 AM
Moon Transit: 11:33 AM
Moonset: 4:13 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

7:00 PM - 9:30 PM
11:03 AM - 1:33 PM

Minor Periods

3:43 PM - 5:13 PM
6:27 AM - 7:57 AM

Action Rating: 4 out of 5

Dense Fog Advisory issued January 17 at 1:34AM PST until January 17 at 10:00AM PST by NWS Sacramento CA

Effective: Sat January 17, 2026, 1:34 AM
Expires: Sat January 17, 2026, 10:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Northern San Joaquin Valley, Southern Sacramento Valley and the Delta. Densest fog is expected near the Sacramento and San Joaquin rivers and the Delta. * WHEN...Until 10 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Saturday, January 17, 2026

Weather Forecast

Sunny
59.2°F
51.4°F
55.2°F
70%
0 in
0%
0%
7.4 mph
0.5


Air Quality

AQI: 2 - Moderate
PM2.5: 26.26 μg/m3
PM10: 27.98 μg/m3
Carbon Monoxide: 363.87 μg/m3
Nitrogen Dioxide: 44.35 μg/m3
Sulphur Dioxide: 6.59 μg/m3
Ozone: 8.64 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:19 AM
Sunset: 5:17 PM
Daylight: 9 hrs 54 mins
Moonrise: 6:57 AM
Moon Transit: 11:33 AM
Moonset: 4:13 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

7:00 PM - 9:30 PM
11:03 AM - 1:33 PM

Minor Periods

3:43 PM - 5:13 PM
6:27 AM - 7:57 AM

Action Rating: 4 out of 5

Sunday, January 18, 2026

Weather Forecast

Sunny
61.2°F
52.8°F
56.3°F
63%
0 in
0%
0%
7.2 mph
0.5


Air Quality

AQI: 2 - Moderate
PM2.5: 32.71 μg/m3
PM10: 34.93 μg/m3
Carbon Monoxide: 620.58 μg/m3
Nitrogen Dioxide: 50.08 μg/m3
Sulphur Dioxide: 7.31 μg/m3
Ozone: 3 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:20 AM
Sunset: 5:18 PM
Daylight: 9 hrs 55 mins
Moonrise: 7:37 AM
Moon Transit: 12:24 AM
Moonset: 5:17 PM
Moon Phase: New
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

7:50 PM - 10:20 PM
11:54 AM - 2:24 PM

Minor Periods

4:47 PM - 6:17 PM
7:07 AM - 8:37 AM

Action Rating: 4 out of 5

Monday, January 19, 2026

Weather Forecast

Sunny
61.4°F
52.6°F
55.7°F
63%
0 in
0%
0%
6.5 mph
0


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:22 AM
Sun Transit: 12:20 AM
Sunset: 5:19 PM
Daylight: 9 hrs 57 mins
Moonrise: 8:12 AM
Moon Transit: 1:13 PM
Moonset: 6:23 PM
Moon Phase: New
Moon Illumination: 0.4%

Best Times for Fishing or Hunting

Major Periods

8:39 PM - 11:09 PM
12:43 AM - 3:13 PM

Minor Periods

5:53 PM - 7:23 PM
7:42 AM - 9:12 AM

Action Rating: 4 out of 5

Tuesday, January 20, 2026

Weather Forecast

Overcast
60.3°F
51.9°F
55.9°F
67%
0 in
0%
0%
6.7 mph
3


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:22 AM
Sun Transit: 12:20 AM
Sunset: 5:20 PM
Daylight: 9 hrs 58 mins
Moonrise: 8:41 AM
Moon Transit: 2:00 PM
Moonset: 7:28 PM
Moon Phase: New
Moon Illumination: 3.1%

Best Times for Fishing or Hunting

Major Periods

9:25 PM - 11:55 PM
1:30 PM - 4:00 PM

Minor Periods

6:58 PM - 8:28 PM
8:11 AM - 9:41 AM

Action Rating: 3 out of 5

Wednesday, January 21, 2026

Weather Forecast

Cloudy
57.4°F
54.2°F
55.6°F
78%
0 in
0%
0%
4.7 mph
3


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:21 AM
Sun Transit: 12:21 AM
Sunset: 5:21 PM
Daylight: 10 hrs mins
Moonrise: 9:07 AM
Moon Transit: 2:45 PM
Moonset: 8:34 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:15 PM - 4:45 PM

Minor Periods

8:04 PM - 9:34 PM
8:37 AM - 10:07 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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