Marine forecast
San Francisco Bay South of the Bay Bridge, CA
- current wind
- 4 kt SW
- Gusts
- 5 kt
- Air
- 62°F
- Water
- 65°F
- 72-hr peak
- 17 kt
Observed Tue 11:54 AM | PZZ531
- Gusts now
- 5 kt
- Air
- 62°F
- Water
- 65°F
- 72-hr peak
- 17 kt
In brief
At 11:54 am PDT on Oct 13, 2026, NDBC station AAMC1 (Alameda, CA, 9 miles away) measured wind from the SW at 4 kt, gusting to 5 kt. The NWS forecast for San Francisco Bay South of the Bay Bridge, CA issued at 8:30 am PDT on Oct 13, 2026 reads, for today: “E wind around 5 kt, backing to NW early this afternoon, then becoming W 15 to 20 kt late.”
Source: National Weather Service San Francisco Bay Area forecast; NDBC observations
Wind forecast · ktPeak 17 kt
NWS marine forecast
| Period | Forecast |
|---|---|
| Today | E wind around 5 kt, backing to NW early this afternoon, then becoming W 15 to 20 kt late. |
| Tonight | W wind 10 to 15 kt, becoming S around 5 kt after midnight. |
| Wed | Light and variable winds, becoming NW 5 to 10 kt in the afternoon. |
| Wed Night | W wind 5 to 10 kt, becoming SW after midnight. |
| Thu | NE wind around 5 kt, backing to N in the afternoon. |
| Thu Night | W wind 5 to 10 kt in the evening, becoming light and variable. |
| Fri | E wind around 5 kt, backing to N in the afternoon. |
| Fri Night | W wind 5 to 10 kt, becoming SW after midnight. |
| Sat | NW wind around 5 kt. |
| Sat Night | W wind 5 to 10 kt. |
Issued Tue 8:30 AM by San Francisco Bay Area (product CWFMTR).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 11:54 AM | 4 kt SW | 5 kt | — | 65°F |
| Tue 10:54 AM | 5 kt W | 6 kt | — | 64°F |
| Tue 9:54 AM | 1 kt W | 2 kt | — | 64°F |
| Tue 8:54 AM | 1 kt E | 2 kt | — | 65°F |
| Tue 7:54 AM | 0 kt | 3 kt | — | 65°F |
| Tue 6:54 AM | 0 kt | 2 kt | — | 65°F |
| Tue 5:54 AM | 4 kt N | 5 kt | — | 65°F |
| Tue 4:54 AM | 0 kt | 2 kt | — | 65°F |
| Tue 3:54 AM | 2 kt W | 3 kt | — | 65°F |
| Tue 2:54 AM | 3 kt W | 5 kt | — | 65°F |
| Tue 1:54 AM | 0 kt | 5 kt | — | 65°F |
| Tue 12:54 AM | 0 kt | 1 kt | — | 65°F |
Observed Tue 11:54 AM at NDBC buoy AAMC1 (Alameda, CA), 9.4 miles away.
Frequently asked questions
What is the marine forecast for San Francisco Bay South of the Bay Bridge today?
Today: E wind around 5 kt, backing to NW early this afternoon, then becoming W 15 to 20 kt late.
Is there a small craft advisory for San Francisco Bay South of the Bay Bridge?
No advisories, warnings or watches are in effect for NWS zone PZZ531 as of the last update on this page. Advisories can be issued at any time; check the current bulletin before leaving the dock.
What is the water temperature at San Francisco Bay South of the Bay Bridge?
The nearest buoy read 65°F (18°C) at Tue 11:54 AM. Sea surface temperature at a single buoy can differ by several degrees from the water at a beach or in a shallow bay nearby.
What do the wind speeds in knots mean?
One knot is 1.15 mph. The National Weather Service issues a small craft advisory for sustained winds of roughly 22–33 knots or hazardous seas, a gale warning at 34–47 knots, and a storm warning at 48 knots and above. Exact advisory thresholds vary by forecast office and by water body — a bay reaches dangerous chop at a lower wind speed than open ocean.
Where does this forecast come from?
The forecast text is the National Weather Service's own marine bulletin for zone PZZ531, issued by San Francisco Bay Area, reproduced in full. The wind and seas charts are drawn from the NWS gridded forecast for a point inside the zone. Observations come from the nearest reporting NDBC buoy. We are not affiliated with NOAA or the National Weather Service.
Forecast: NOAA/NWS product CWFMTR, issued Tue 8:30 AM. Observations: NOAA National Data Buoy Center station AAMC1, read Tue 11:54 AM. Retrieved Oct 13, 12:42 PM. Conditions offshore change faster than any page can be rebuilt, so check the current NWS bulletin and your own instruments before going out.