Should you sail in San Francisco Bay?
CAUTION — Sail only if you are experienced and prepared. Sailing score 49/100 · United States. Strong wind — experienced crew only. Poor visibility likely. Similar sailing quality expected over the next 24 hours.
About sailing in San Francisco Bay
San Francisco Bay is one of the world's great urban sailing arenas—Golden Gate pressure gradients, Alcatraz tides, and summer seabreeze that builds from the Pacific through the Gate. Clubs race on the cityfront; cruisers reach Angel Island and Sausalito from Berkeley or Emeryville marinas.
Best time to sail
April through October delivers reliable afternoon westerlies; September and October often bring the warmest sailing weather. Winter fronts bring steep chop and reduced visibility in the central bay.
Sailing notes
Treat the Gate as a separate passage—ebb against westerly swell stacks steep seas. Commercial traffic lanes east of Alcatraz need wide clearance. Fog can drop visibility below 100 m in summer mornings while the East Bay stays clear.
Wind and local conditions
Post-noon seabreeze typically fills 15–25 knots from the west through the Golden Gate, while mornings stay light and foggy. Diablo winds in fall can gust 35+ knots with little warning. Inside the bay, wind shadows behind the Berkeley hills and Angel Island create deceptive calm patches.
What SailCall covers
Wind, seas, rain, visibility, and pressure for today's coastal day sail, using WeatherAPI.com forecast and marine data. Wave outlook is included; tide times are not yet — check a local tide table before harbor entry. Not a chart plotter or passage planner.
Should I go sailing today?
San Francisco Bay
CAUTION
Sail only if you are experienced and prepared
49
Sailing score
Next 24 hours
Hourly sailing comfort at the harbor — today and tomorrow are local to the marina.
No strong sailing windows in the next 24 hours.
Boat type
Showing Keelboat wind thresholds
Hover or tap an hour for details · Next 24 hours
At harbor: Sat, Jul 4, 5:00 AM (Pacific Daylight Time)
The call
You could sail near San Francisco Bay today, but strong wind — experienced crew only.
Location
San Francisco Bay, United States
Today's seas
No marine wave data for this point. Try searching closer to open water or a coastal waypoint. Offshore forecasts need a sea position, not an inland pin.
Conditions at a glance
What stood out in the forecast
Wind
Fair18 kt · BF 5
Sustained to 18 kt · gusts to 22 kt · BF 6
Beaufort 6 — manageable for experienced crews but not relaxing. Reef before open water, plan a route with lee shore options, and expect harder docking and mooring picks.
Rain
Good2%
0.0 mm total · 2% peak chance · 0 wet hour(s)
Little rain expected — one less factor stealing visibility and grip on deck. Still pack a light jacket; conditions change faster on the water than ashore.
Air temperature
Good15°C
Air 11–15°C · feels like 9–15°C
Comfortable air temperatures for deck work, but water temperature may still be much colder — a dip without proper gear can shock even on a warm day.
Visibility
Poor0.05 nm
Lowest 0.05 nm · best 6.6 nm today
Sight distance down to about 0.05 nm — treat it like restricted visibility: slower speed, extra lookouts, sound signals where rules require, and AIS/radar if fitted. Ferry lanes and busy harbors deserve extra margin.
Barometric pressure
Good1016 hPa
1016 hPa → steady
Pressure is steady — no strong synoptic system pushing through on this snapshot. Local wind, sea breeze, and geography still dominate near shore.
UV / sun
PoorUV 8.2
Very high index — limit bare-skin time on deck. · peak near 14:00
UV 8.2 is very high — water reflection adds exposure you do not feel on land. Broad-spectrum SPF, hat, lip protection, and hydration reduce fatigue; consider shade breaks if you are out all day.
Why we said CAUTION
What pushed the score — how we score
Strong wind — experienced crew only
HighWinds up to 18 kt, gusts to 22 kt. Reef early and avoid exposed passages.
Poor visibility likely
HighVisibility down to 0.00 nm — navigation and comfort suffer.
Marine data unavailable
HighWave forecast could not be loaded for this point. Try a location closer to open water.
How we decided
We score sailing conditions with fixed thresholds, so you can see why we picked go, caution, or no-go. Official charts, tide books, and your own judgment still run the show.
- GO — sailing score ≥70 with no critical blockers
- CAUTION — score 45–69, or manageable risks
- NO-GO — score <45 or dangerous wind/seas/storms
Engine v1.1.19 · open_meteo marine + forecast · Evaluated Sat, Jul 4, 5:24 AM (Pacific Daylight Time) · limited marine data
What should I do?
What to do next
Similar sailing quality expected over the next 24 hours
Conditions should improve around Today 5:00 AM (Pacific Daylight Time) — consider delaying departure until then.
At harbor: Sat, Jul 4, 5:00 AM (Pacific Daylight Time)
Reef early and wear PFDs
Reduce sail area before leaving the harbor and keep crew in life jackets.
Reduce speed and watch for traffic
Low visibility makes collisions and navigation errors more likely — use radar and AIS if equipped.
Consider a sheltered route
Stay inside the bay or in the lee of the land if you go out.
Day outlook
2-day · °C, kt, m, nm, mm
Today
Poor
15°C / 11°C
No rain · 18 kt · BF 5
Not ideal: poor visibility (remaining hours).
Tomorrow
Poor
15°C / 12°C
No rain · 15 kt · BF 4
Not ideal: poor visibility.
Forecast data from third-party providers.