Water Temperature of San Francisco Bay in San Francisco, CA

Current Water Temperature

55.4°F

Measurement Time: Wednesday, May 27, 2026, 3:00 PM PDT

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

55.9°F
Overcast
Overcast
55°F
52.4°F
77%
SSW 5.4 mph
7.7 mph
50.1°F
51.3°F
0 in
100%
9 mi
1011 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 70°F
L: 49°F
Moderate rain
Thu
H: 66°F
L: 51°F
Patchy rain nearby
Fri
H: 60°F
L: 53°F
Sunny
Sat
H: 59°F
L: 52°F
Sunny
Sun
H: 64°F
L: 51°F

Air Quality

AQI: 1 - Good
PM2.5: 10.35 μg/m3
PM10: 14.35 μg/m3
Carbon Monoxide: 113.85 μg/m3
Nitrogen Dioxide: 12.05 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 59 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 1:06 PM
Sunset: 8:23 PM
Daylight: 14 hrs 32 mins
Moonrise: 5:21 PM
Moon Transit: 10:41 PM
Moonset: 3:28 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.7%

Best Times for Fishing or Hunting

Major Periods

5:22 AM - 7:52 AM
12:00 AM - 12:00 AM

Minor Periods

4:51 PM - 6:21 PM
2:58 AM - 4:28 AM

Action Rating: 3 out of 5

Beach Hazards Statement issued May 27 at 7:15PM PDT until May 29 at 3:00AM PDT by NWS San Francisco CA

Effective: Wed May 27, 2026, 7:15 PM
Expires: Thu May 28, 2026, 3:15 AM

* WHAT...Increased risk of sneaker waves and strong rip currents due to incoming long period northwesterly swell. * WHERE...Beaches along the Pacific Coast. * WHEN...From Thursday morning through late Thursday night. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion can be expected. Sneaker waves can sweep across the shoreline without warning, pulling people into the sea from rocks, jetties and beaches.

Stay off of jetties, piers, rocks, and other waterside infrastructure. Remain out of the water to avoid hazardous surf and NEVER turn your back on the ocean. Monitor local weather, surf and tide forecasts at www.weather.gov/mtr.
Wednesday, May 27, 2026

Weather Forecast

Sunny
69.8°F
48.6°F
57.6°F
79%
0 in
0%
0%
14.1 mph
6.4


Air Quality

AQI: 1 - Good
PM2.5: 8.62 μg/m3
PM10: 13.2 μg/m3
Carbon Monoxide: 124.49 μg/m3
Nitrogen Dioxide: 6.4 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 58.16 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 1:06 PM
Sunset: 8:23 PM
Daylight: 14 hrs 32 mins
Moonrise: 5:21 PM
Moon Transit: 10:41 PM
Moonset: 3:28 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.7%

Best Times for Fishing or Hunting

Major Periods

5:22 AM - 7:52 AM
12:00 AM - 12:00 AM

Minor Periods

4:51 PM - 6:21 PM
2:58 AM - 4:28 AM

Action Rating: 3 out of 5

Thursday, May 28, 2026

Weather Forecast

Moderate rain
65.9°F
51.4°F
57.2°F
76%
0.29 in
85%
0%
14.8 mph
6.4


Air Quality

AQI: 1 - Good
PM2.5: 10.65 μg/m3
PM10: 15.7 μg/m3
Carbon Monoxide: 117.85 μg/m3
Nitrogen Dioxide: 8.05 μg/m3
Sulphur Dioxide: 1.81 μg/m3
Ozone: 71.32 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 1:07 PM
Sunset: 8:24 PM
Daylight: 14 hrs 33 mins
Moonrise: 6:23 PM
Moon Transit: 11:26 PM
Moonset: 3:54 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.7%

Best Times for Fishing or Hunting

Major Periods

6:06 AM - 8:36 AM
12:00 AM - 12:00 AM

Minor Periods

5:53 PM - 7:23 PM
3:24 AM - 4:54 AM

Action Rating: 3 out of 5

Friday, May 29, 2026

Weather Forecast

Patchy rain nearby
59.5°F
53.2°F
56°F
83%
0.01 in
87%
0%
10.3 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 9.45 μg/m3
PM10: 13.92 μg/m3
Carbon Monoxide: 112.48 μg/m3
Nitrogen Dioxide: 5.27 μg/m3
Sulphur Dioxide: 2.02 μg/m3
Ozone: 76.12 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:07 PM
Sunset: 8:25 PM
Daylight: 14 hrs 34 mins
Moonrise: 7:24 PM
Moon Transit: 12:00 AM
Moonset: 4:23 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
6:51 AM - 9:21 AM

Minor Periods

6:54 PM - 8:24 PM
3:53 AM - 5:23 AM

Action Rating: 4 out of 5

Saturday, May 30, 2026

Weather Forecast

Sunny
59.3°F
52.3°F
55.2°F
79%
0 in
0%
0%
13.9 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 11.66 μg/m3
PM10: 17.72 μg/m3
Carbon Monoxide: 121.99 μg/m3
Nitrogen Dioxide: 5.3 μg/m3
Sulphur Dioxide: 1.6 μg/m3
Ozone: 70.6 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:07 PM
Sunset: 8:25 PM
Daylight: 14 hrs 35 mins
Moonrise: 8:25 PM
Moon Transit: 12:13 AM
Moonset: 4:57 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:39 AM - 10:09 AM

Minor Periods

7:55 PM - 9:25 PM
4:27 AM - 5:57 AM

Action Rating: 4 out of 5

Sunday, May 31, 2026

Weather Forecast

Sunny
63.6°F
51.3°F
56.8°F
73%
0 in
0%
0%
10.7 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 12.58 μg/m3
PM10: 19.5 μg/m3
Carbon Monoxide: 129.77 μg/m3
Nitrogen Dioxide: 8.36 μg/m3
Sulphur Dioxide: 1.49 μg/m3
Ozone: 67.23 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:07 PM
Sunset: 8:26 PM
Daylight: 14 hrs 36 mins
Moonrise: 9:22 PM
Moon Transit: 1:02 AM
Moonset: 5:37 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:32 AM - 3:02 AM
8:30 AM - 11:00 AM

Minor Periods

8:52 PM - 10:22 PM
5:07 AM - 6:37 AM

Action Rating: 4 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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