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 January 5 at 11:43PM PST until January 9 at 10:00PM PST by NWS San Francisco CA

Effective: Mon January 5, 2026, 11:43 PM
Expires: Wed January 7, 2026, 1:00 AM

* WHAT...Large breaking waves up to 22 feet, strong rip currents and sneaker waves. * WHERE...Pacific Coast. * WHEN...From 1 AM Thursday to 10 PM PST Friday. * IMPACTS...There is an increased risk for sneaker waves, strong rip currents, and beach erosion. Large breaking waves can overpower swimmers resulting in significant physical injury and increase the risk of drowning.

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

High Surf Advisory issued January 7 at 1:01AM PST until January 8 at 3:00PM PST by NWS San Francisco CA

Effective: Wed January 7, 2026, 1:01 AM
Expires: Wed January 7, 2026, 3:15 PM

* WHAT...Large breaking waves up to 22 feet, strong rip currents and sneaker waves. * WHERE...Pacific Coast from Sonoma county to Monterey county, excluding Northern Monterey Bay. * WHEN...From 1 AM to 3 PM PST Thursday. * IMPACTS...There is an increased risk for sneaker waves, strong rip currents, and beach erosion. Large breaking waves can overpower swimmers resulting in significant physical injury and increase the risk of drowning.

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

Extreme Cold Watch issued January 7 at 12:56AM PST until January 9 at 9:00AM PST by NWS San Francisco CA

Effective: Wed January 7, 2026, 12:56 AM
Expires: Wed January 7, 2026, 9:00 AM

* WHAT...Very cold conditions with temperatures in the low to mid 30s possible except for Interior Monterey and San Benito Counties where temperatures in the upper 20s are possible. * WHERE...The East Bay and San Francisco Bay Shoreline, The Central Coast, The Santa Clara Valley and Eastern Hills, The Salinas and Carmel Valleys and Hollister Area, The Marin Hills, The Santa Cruz Mountains, and North Bay Interior Valleys. * WHEN...1 AM Friday to 9 AM Friday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock.

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.

Flood Advisory issued January 6 at 5:49PM PST until January 7 at 12:30AM PST by NWS San Francisco CA

Effective: Tue January 6, 2026, 5:49 PM
Expires: Wed January 7, 2026, 12:30 AM

* WHAT...River and stream flooding caused by excessive rainfall is expected. * WHERE...Areas west of a line from Cotati to Healdsburg in the Sonoma coastal range. * Until 1230 AM PST Wednesday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. River or stream flows are elevated. * ADDITIONAL DETAILS... - At 548 PM PST, River gauge reports indicated minor flooding. The Russian River at Guerneville is now in action stage, with a forecast to fall below action stage after around midnight. The Russian River near Guernville is also in action stage, while also forecast to recede below action stage around midnight. - Flooding impacts will continue, but no additional rainfall is expected. - Some locations that will experience flooding include... Santa Rosa, Rohnert Park, Windsor, Healdsburg, Sebastopol, Cotati, Tomales, Larkfield-Wikiup, Dillon Beach, Roseland, South Santa Rosa Cdp, Forestville, Guerneville, Occidental, Graton, Monte Rio, Bodega Bay and South Santa Rosa. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Be aware of your surroundings and do not drive on flooded roads. Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely.