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Alcatraz, CA Weather Forecast

Alcatraz Island, San Francisco Bay, CA 94133 (415) 561-4900

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Mostly Cloudy

63°F

Updated	1:01 pm
Feels Like	60°F
Humidity	75%
Wind	W 8 mph
Barometer	30.15 in
Dew Point	55°F

Mostly Cloudy

17°C

Updated	1:01 pm
Feels Like	16°C
Humidity	75%
Wind	W 13 km/h
Barometer	102.1 kPa
Dew Point	13°C

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Cloud Cover	100%
uv UV Index	3
Sunrise	6:40 AM
Sunset	5:06 PM
Moonrise	4:09 AM
Moonset	3:30 PM

Civil Twilight
6:10 AM to 6:38 AM
5:05 PM to 5:32 PM
Alcatraz CA Weather - Waning Crescent Moon

Waning Crescent Moon

Alcatraz Weather Forecast

REST OF TODAY	TONIGHT	SATURDAY	SATURDAY NIGHT	SUNDAY	SUNDAY NIGHT	MONDAY	MONDAY NIGHT	TUESDAY	TUESDAY NIGHT	VETERANS DAY	WEDNESDAY NIGHT

Partly Cloudy	Mostly Clear	Partly Cloudy	Patchy Fog	Patchy Fog	Partly Cloudy	Partly Cloudy	Partly Cloudy	Mostly Clear	Mostly Clear	Partly Cloudy	Chance of Rain
Hi: 71°FHi: 22°C	Lo: 51°FLo: 11°C	Hi: 73°FHi: 23°C	Lo: 53°FLo: 12°C	Hi: 71°FHi: 22°C	Lo: 51°FLo: 11°C	Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C	Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C	Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C	Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C	Hi: 70°FHi: 21°C	Hi: 66°FHi: 19°C Lo: 55°FLo: 13°C

POP = Probability of Precipitation.

Weather Outlook Updated: 1002 AM PST Fri Nov 06 2026 Alcatraz, CA Weather - WeatherWorld.com

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Issued: 1232 PM PST Fri Nov 6 2026

Key Messages

Updated at 1229 PM PST Fri Nov 6 2026

Slightly warmer and dry weather through early next week
Coastal flooding due to high tides through Friday (11/13)
Hazardous beach conditions through Monday
Unsettled weather returns by late next week

Aviation

... (18Z TAFS) Issued at 944 AM PST Fri Nov 6 2026

VFR conditions will prevail through the forecast period with a slight chance of fog developing in the North Bay late in the overnight period to early Saturday morning.

Vicinity of SFO...VFR cond...

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Weather 101: Term of the Day

Mesoscale Discussion

When conditions actually begin to shape up for severe weather, SPC (Storm Prediction Center) often issues a Mesoscale Discussion (MCD) statement anywhere from roughly half an hour to several hours before issuing a weather watch. SPC also puts out MCDs for hazardous winter weather events on the mesoscale, such as locally heavy snow, blizzards and freezing rain (see below). MCDs are also issued on occasion for heavy rainfall, convective trends, and other phenomena, when the forecaster feels he/she can provide useful information that is not readily available or apparent to field forecasters. MCDs are based on mesoscale analysis and interpretation of observations and of short term, high resolution numerical model output. The MCD basically describes what is currently happening, what is expected in the next few hours, the meteorological reasoning for the forecast, and when/where SPC plans to issue the watch (if dealing with severe thunderstorm potential). Severe thunderstorm MCDs can help you get a little extra lead time on the weather and allow you to begin gearing up operations before a watch is issued. The MCD begins with a numerical string that gives the LAT/LON coordinates of a polygon that loosely describes the area being discussed.