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 9 at 8:54AM PST until January 9 at 10:00PM PST by NWS San Francisco CA

Effective: Fri January 9, 2026, 8:54 AM
Expires: Fri January 9, 2026, 10:00 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...Until 10 PM PST this evening. * 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.

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

Cold Weather Advisory issued January 9 at 1:07PM PST until January 10 at 9:00AM PST by NWS San Francisco CA

Effective: Fri January 9, 2026, 1:07 PM
Expires: Fri January 9, 2026, 9:15 PM

* WHAT...Cold conditions with temperatures in the low to mid 30s expected. * WHERE...The Santa Clara Valley and Eastern Hills, The East Bay Hills and Valleys, Monterey Bay and the Big Sur Coast, The Marin Hills, The Santa Cruz Mountains, Interior Monterey County and the Santa Lucia Range, North Bay Interior Valleys, and Northern Salinas Valley/Hollister Valley and Carmel Valley. * WHEN...From 1 AM to 9 AM PST Saturday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken.

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.