San Francisco Bay Water Temperature, Tides & Buoy Report

Region: California

San Francisco Bay is the largest Pacific estuary on the West Coast, covering approximately 1,100 square miles of connected bays — San Francisco, San Pablo, Suisun, and the Delta — each with distinct oceanographic characteristics. The Golden Gate, the narrow strait connecting the bay to the Pacific, funnels some of the strongest tidal currents on the West Coast and creates a dramatic interface between the cold Pacific and the warmer bay interior.

NOAA Stations Near San Francisco Bay

Frequently Asked Questions

What conditions does Big Buoy track near San Francisco Bay?
Big Buoy provides real-time water temperature, wave height, swell period and direction, wind speed and direction, and atmospheric pressure from NOAA stations across the region, including San Francisco (ocean reference), San Francisco Bar (bay entrance), and Point Reyes (northern California coast). You also get 7-day tide forecasts, solunar tables, and extended weather outlooks for the bay and surrounding coast.
What are the tidal currents like at San Francisco Bay?
The Golden Gate funnels some of the strongest tidal currents on the West Coast — currents routinely exceed 4–5 knots at the Gate during peak flow. Tidal timing is critical for navigating the bay entrance. The best conditions for crossing the bar typically occur near slack water, with the most challenging conditions when current opposes swell.
What conditions should I check before heading out on San Francisco Bay?
Tidal current timing at the Golden Gate is the first thing to check — the 4–5 knot currents create dangerous conditions when opposing swell. Ocean conditions outside the Gate can be completely different from inside the bay, with water temperatures 10–15°F colder due to Pacific upwelling. Check fog conditions — it can be clear inside the bay and thick outside the Gate. The afternoon westerly wind is reliable from spring through fall and builds chop on the central bay. Big Buoy shows real-time data from both the ocean and bar stations so you can compare conditions inside and outside the Gate.
What NOAA stations does Big Buoy track near San Francisco Bay?
Big Buoy tracks 882 NOAA buoys and 3,400+ tide stations nationwide, with many in the San Francisco Bay area — including SAN FRANCISCO - 18NM West of San Francisco, CA (46026), San Francisco Bar, CA (142) (46237), Point Reyes, CA (029) (46214). Each station reports water temperature, wave height, wind speed and direction, and more — updated every 10 minutes. Open the map to see all stations near San Francisco Bay.
What marine conditions are available for San Francisco Bay?
Big Buoy shows real-time water temperature, wave height, swell period, wind speed and direction, 7-day tide tables with exact high and low times, and daily solunar peak windows for San Francisco Bay.
Is Big Buoy free to use for San Francisco Bay marine conditions?
Yes. Real-time buoy data, tides, and solunar for San Francisco Bay are completely free with no account required. Big Buoy Pro adds the Wind Tab, the Depth Chart, satellite overlays (sea surface temp, chlorophyll, currents), 16-day forecasts, and forecast model switching.