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

High Surf Advisory issued December 26 at 3:41AM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Fri December 26, 2025, 3:41 AM
Expires: Fri December 26, 2025, 3:00 PM

* WHAT...Large breaking waves up to 25 feet, strong rip currents and sneaker waves. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast, Northern Monterey Bay and Southern Monterey Bay and Big Sur Coast Counties. * WHEN...For the Beach Hazards Statement, through 4 AM Friday. For the High Surf Advisory, from 4 AM to 10 PM PST Friday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion.

Inexperienced swimmers should remain out of the water due to dangerous surf conditions.

Flood Watch issued December 26 at 5:38AM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Fri December 26, 2025, 5:38 AM
Expires: Fri December 26, 2025, 10:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible from multiple lines of showers and thunderstorms, strong at times, moving across the area. * WHERE...San Francisco County, San Mateo Peninsula, East Bay, South Bay, and Central Coast * WHEN...Through this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Soils are saturated from the last few days of rain. Showers and thunderstorm with high rain rates may lead to flash flooding and the potential for landslides. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

High Surf Advisory issued December 26 at 2:28PM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Fri December 26, 2025, 2:28 PM
Expires: Fri December 26, 2025, 10:00 PM

* WHAT...Large breaking waves up to 25 feet, strong rip currents and sneaker waves. * WHERE...Pacific Coast beaches. * WHEN...Until 10 PM PST this evening. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion.

Inexperienced swimmers should remain out of the water due to dangerous surf conditions.

Flood Watch issued December 26 at 5:38AM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Fri December 26, 2025, 5:38 AM
Expires: Fri December 26, 2025, 10:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible from multiple lines of showers and thunderstorms, strong at times, moving across the area. * WHERE...The Northern San Francisco Bay Area (Napa, Sonoma, and Marin counties). * WHEN...Through this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Soils are saturated from the last few days of rain. Showers and thunderstorm with high rain rates may lead to flash flooding and the potential for landslides. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Flood Watch issued December 25 at 7:45PM PST until December 26 at 4:00PM PST by NWS Sacramento CA

Effective: Thu December 25, 2025, 7:45 PM
Expires: Fri December 26, 2025, 4:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northern California, including the following areas, Sacramento Valley, northern San Joaquin Valley, Delta region, and the foothills of the Sierra Nevada. * WHEN...Through Friday afternoon. * IMPACTS...Excessive runoff will result in rises along area rivers, creeks, streams. Small streams and creeks may rise out of their banks. Flooding may occur in low-lying, poor drainage, and urban areas. Mudslides and rockslides may occur in mountain and foothill areas. * ADDITIONAL DETAILS... - Periods of moderate to heavy rain are forecast into Friday. Debris flows are not expected over recent burn scars in northern California, but do anticipate enhanced runoff in/below scars. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Flood Advisory issued December 25 at 6:59PM PST until December 26 at 6:00PM PST by NWS Sacramento CA

Effective: Thu December 25, 2025, 6:59 PM
Expires: Fri December 26, 2025, 6:00 PM

* WHAT...Flooding caused by excessive rainfall continues. * WHERE...A portion of northern California, including the following counties, Butte, Colusa, Glenn, Sacramento, Solano, Sutter and Yolo. * WHEN...Until 600 PM PST Friday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. * ADDITIONAL DETAILS... - At 656 PM PST, Doppler radar indicated moderate to heavy rain. Minor flooding is ongoing or expected to begin shortly in the advisory area. - Periods of moderate to heavy rainfall is forecast to occur in the advisory area into Friday, resulting in flooding. - Some locations that will experience flooding include... Vallejo, Fairfield, Vacaville, Davis, Woodland, Benicia, Rumsey, Maxwell, Suisun City, Dixon, Winters, Gridley, Colusa, Dunnigan, Capay, Zamora, Madison, Cadenasso, Brooks and Tancred. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.

Flood Advisory issued December 25 at 6:59PM PST until December 26 at 6:00PM PST by NWS Sacramento CA

Effective: Thu December 25, 2025, 6:59 PM
Expires: Fri December 26, 2025, 6:00 PM

* WHAT...Flooding caused by excessive rainfall continues. * WHERE...Portions of central and northern California, including the following counties, in central California, Placer. In northern California, Amador, Butte, Calaveras, El Dorado, Nevada, Sacramento, San Joaquin, Sierra, Solano, Stanislaus, Sutter, Tuolumne, Yolo and Yuba. * WHEN...Until 600 PM PST Friday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. * ADDITIONAL DETAILS... - At 656 PM PST, Doppler radar indicated moderate to heavy rain. Minor flooding is ongoing or expected to begin shortly in the advisory area. - Periods of moderate to heavy rainfall is forecast to occur in the advisory area into Friday, resulting in flooding. - Some locations that will experience flooding include... Sacramento, Stockton, Modesto, Elk Grove, Roseville, Citrus Heights, Tracy, Folsom, Turlock, Rocklin, Ceres, Galt, Oakdale, Auburn, Grass Valley, Marysville, Placerville, Sonora, Jackson and Paloma. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.

Wind Advisory issued December 26 at 9:49AM PST until December 26 at 6:00PM PST by NWS Sacramento CA

Effective: Fri December 26, 2025, 9:49 AM
Expires: Fri December 26, 2025, 6:00 PM

* WHAT...South winds 10 to 20 mph with gusts up to 40 mph. * WHERE...Carquinez Strait and Delta, Sacramento Valley, Motherlode, Northeast Foothills, and Northern San Joaquin Valley. * WHEN...Until 6 PM PST this evening. * IMPACTS...Gusty winds will blow around unsecured objects and holiday decorations. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Breezy to gusty southerly winds are expected through the afternoon, gradually decreasing by the evening.

Gusty winds can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.