Station Name: SAN FRANCISCO BAY 2.8 MI N OF SAN MATEO BRIDGE CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
San Francisco Bay
San Mateo, CA 94401
San Mateo County

GPS Coordinates: 37.63078889, -122.2432

Nearby Water Temperatures

Flood Watch issued December 25 at 7:16AM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Thu December 25, 2025, 7:16 AM
Expires: Fri December 26, 2025, 7:15 AM

* 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 Friday 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. Low water crossings may become flooded. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Numerous lines of showers and thunderstorms will move across the Bay Area and Central Coast through Friday evening. An additional 1-2" of rain is expected across the interior with locally higher totals between 2-3" across the Santa Cruz Mountains and up to 3" across the Santa Lucia Range. Flooding potential will increase with each successive round of rain. Sharp rises in smaller creeks and streams are expected with at least some potential for minor flooding in mainstream rivers. - 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.

Beach Hazards Statement issued December 25 at 2:47PM PST until December 26 at 4:00AM PST by NWS San Francisco CA

Effective: Thu December 25, 2025, 2:47 PM
Expires: Fri December 26, 2025, 4:00 AM

* WHAT...For the Beach Hazards Statement, strong winds will lead to blowing and drifting sand, wind waves up to 20 ft, and result in poor visibility along coastal beaches. For the High Surf Advisory, 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 can be expected. Sneaker waves can sweep across the shoreline without warning, pulling people into the sea from rocks, jetties and beaches. 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. 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.

High Surf Advisory issued December 25 at 2:47PM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Thu December 25, 2025, 2:47 PM
Expires: Fri December 26, 2025, 4:00 AM

* WHAT...For the Beach Hazards Statement, strong winds will lead to blowing and drifting sand, wind waves up to 20 ft, and result in poor visibility along coastal beaches. For the High Surf Advisory, 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 can be expected. Sneaker waves can sweep across the shoreline without warning, pulling people into the sea from rocks, jetties and beaches. 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. 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.

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 Advisory issued December 26 at 2:03AM PST until December 26 at 4:45AM PST by NWS San Francisco CA

Effective: Fri December 26, 2025, 2:03 AM
Expires: Fri December 26, 2025, 4:45 AM

* WHAT...Flooding caused by excessive rainfall continues. * WHERE...Northwestern Santa Clara County and northwestern Santa Cruz County in northern California... * Until 445 AM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 203 AM PST, Doppler radar indicated heavy rain. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 0.5 inches of rain have fallen. - Some locations that will experience flooding include... San Jose, Sunnyvale, Santa Clara, Milpitas, Cupertino, Campbell, Saratoga, Los Gatos, Rancho Rinconada Cdp, Fruitdale, Buena Vista, Sunol-Midtown, Boulder Creek, Alum Rock, Ben Lomond, East Foothills, Monte Sereno, Cambrian Park, Rancho Rinconada and Lexington Hills. - 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.

Flood Watch issued December 25 at 7:16AM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Thu December 25, 2025, 7:16 AM
Expires: Fri December 26, 2025, 7:15 AM

* 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 Friday 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. Low water crossings may become flooded. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Multiple rounds of moderate to heavy rainfall are expected across the North Bay through Friday evening. An additional 2-4" is possible over the North Bay Mountains and 1-3" over the North Bay Valleys by Friday. Nuisance flooding will increase through Friday with rises in smaller creeks and minor flooding along some of the mainstream rivers (Russian River, Napa River). Debris flows are possible particularly for the Pickett Burn Scar. - 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.