Nearby Harbors
37.8267’ N, 122.4170’ W

Alcatraz Island, CA

56°
H -°
L 51°
NW
2mph
High tide
5:54 am
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Alcatraz Island, CA Weather Forecast and Current Conditions

Day Sky High / Low Precip Wind Humidity
Sat
Oct 31 		Rain Late -º / 51º 100% N 4 mph 85%
Sun
Nov 1 		Partly Cloudy
View Hourly 		66º / 50º 10% NW 11 mph 68%
12am Cloudy 56º 17% NW 2 mph 78%
1am Showers 55º 47% NW 3 mph 80%
1am Rain 55º 100% WSW 3 mph 82%
2am Rain 53º 100% S 3 mph 89%
3am Showers 53º 46% ENE 3 mph 90%
4am Few Showers 53º 33% NNE 4 mph 90%
5am Few Showers 53º 30% NE 4 mph 89%
6am Partly Cloudy 52º 10% N 4 mph 88%
7am Partly Cloudy 52º 10% N 4 mph 88%
8am Partly Cloudy 53º 7% N 6 mph 89%
9am Mostly Sunny 55º 6% NNW 6 mph 84%
10am Sunny 58º 4% NNW 6 mph 76%
11am Sunny 60º 2% NNW 5 mph 67%
12pm Sunny 61º 1% NW 6 mph 61%
1pm Sunny 63º 1% W 7 mph 58%
2pm Sunny 64º 1% WSW 8 mph 56%
3pm Sunny 64º 1% WSW 11 mph 55%
4pm Sunny 64º 1% W 10 mph 57%
5pm Sunny 63º 1% WNW 10 mph 60%
6pm Clear 60º 2% WNW 8 mph 67%
7pm Clear 58º 3% NW 6 mph 71%
8pm Clear 57º 3% WNW 4 mph 75%
9pm Clear 56º 4% NW 3 mph 79%
10pm Mostly Clear 55º 4% NW 2 mph 81%
11pm Partly Cloudy 54º 5% NNW 2 mph 82%
Mon
Nov 2 		Cloudy
View Hourly 		66º / 54º 20% S 6 mph 72%
12am Mostly Cloudy 54º 5% WSW 2 mph 85%
1am Partly Cloudy 53º 6% SE 2 mph 88%
2am Mostly Cloudy 52º 7% SE 2 mph 89%
3am Mostly Cloudy 52º 7% SE 2 mph 91%
4am Mostly Cloudy 51º 8% ESE 3 mph 92%
5am Mostly Cloudy 51º 11% ESE 3 mph 94%
6am Mostly Cloudy 51º 20% ESE 3 mph 94%
7am Cloudy 51º 20% ESE 3 mph 95%
8am Cloudy 53º 20% E 4 mph 92%
9am Cloudy 56º 6% ESE 4 mph 85%
10am Mostly Cloudy 59º 5% ESE 4 mph 77%
11am Mostly Cloudy 61º 4% ESE 4 mph 70%
12pm Cloudy 63º 3% E 4 mph 66%
1pm Cloudy 64º 2% W 5 mph 62%
2pm Cloudy 64º 2% W 6 mph 60%
3pm Cloudy 64º 2% W 5 mph 60%
4pm Cloudy 64º 2% WSW 6 mph 62%
5pm Cloudy 63º 3% W 6 mph 65%
6pm Cloudy 60º 7% W 6 mph 71%
7pm Cloudy 59º 7% W 5 mph 75%
8pm Cloudy 58º 7% WSW 4 mph 78%
9pm Cloudy 58º 8% SSE 4 mph 79%
10pm Cloudy 57º 8% SE 4 mph 81%
Tue
Nov 3 		Showers 65º / 52º 50% S 10 mph 77%
Wed
Nov 4 		Partly Cloudy 69º / 51º 7% NNW 10 mph 69%
Thu
Nov 5 		Partly Cloudy 70º / 51º 19% NNW 9 mph 69%
Fri
Nov 6 		Partly Cloudy 72º / 51º 18% NNW 8 mph 64%
Sat
Nov 7 		Mostly Sunny 72º / 52º 3% N 7 mph 56%

Weather Radar for Alcatraz Island, CA See Radar

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* Playback displays weather for the past 6 hours.

NOAA Weather Marine Forecast for Alcatraz Island, CA

Tonight
Low : 56ºF
W wind 6 to 8 kt becoming SE after midnight. Showers likely, mainly before 4am.
Sunday
High : 60ºF
NNE wind 6 to 13 kt becoming W in the afternoon. Partly sunny, then gradually becoming sunny.
Sunday Night
Low : 56ºF
WNW wind 7 to 12 kt becoming variable and less than 5 kt in the evening. Mostly clear.
Monday
High : 62ºF
Variable winds 5 kt or less. Partly sunny.
Monday Night
Low : 57ºF
WNW wind 5 to 8 kt becoming SE after midnight. Mostly cloudy.
Tuesday
High : 61ºF
SSW wind 8 to 11 kt becoming SSE in the morning. A chance of showers.
Tuesday Night
Low : 57ºF
SW wind 8 to 10 kt becoming E after midnight. A chance of showers, mainly before 11pm.
Wednesday
High : 62ºF
ENE wind around 6 kt becoming variable and less than 5 kt. Mostly sunny.
Wednesday Night
Low : 57ºF
W wind 7 to 12 kt becoming variable and less than 5 kt after midnight. Partly cloudy.

NOAA Buoy Data Near Alcatraz Island, CA See Map

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    Wind Speed Forecast for Alcatraz Island, CA

    SundayMondayTuesday
    Wind Speed (MPH) 2345116223455
    7am11am3pm7pm11pm3am7am11am3pm7pm11pm3am
    MPH 2345116223455
    DIR NWENENNNWWSWNWNNWSEESEESEWW

    Current Weather Conditions In Alcatraz Island, CA

    As Of: 16 minutes ago

    • 56ºF
    • 56ºF
    • 2mph
    • 0º (NW)
    • 2mph
    • Cloudy
    • 8mi
    • 29.85"
    • 78%
    • 0ºF

    The weather right now in Alcatraz Island, CA is Cloudy. The current temperature is 56°F, and the expected high and low for today, Sunday, November 1, 2026, are -° high temperature and 51°F low temperature. The wind is currently blowing at 2 miles per hour, and coming from the Northwest. The wind is gusting to 2 mph. With the wind and the atmosphere the temperature feels like 56° Fahrenheit. Expected precipitation is 17 percent, with current humidity at 78 percent, and air pressure at 29.85 in. Visibility is 8 nautical miles. There are 2 current weather alert(s).

    Weather Alerts
    Beach Hazard Statement - 5:58pm Sat Oct 31 2026

    ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 6 PM PDT SUNDAY... ...BEACH HAZARDS STATEMENT IN EFFECT FROM LATE SUNDAY NIGHT THROUGH TUESDAY EVENING...

    WHAT: For the Coastal Flood Advisory, Up to 1.5 ft of
    inundation above ground level is possible in low-lying areas
    near shorelines and tidal waterways. For the Beach Hazards
    Statement, An increased risk for sneaker waves and strong rip
    currents.

    WHERE: San Francisco, Northern Monterey Bay and Southern
    Monterey Bay and Big Sur Coast Counties.

    WHEN: For the Coastal Flood Advisory, until 6 PM PDT Sunday.
    For the Beach Hazards Statement, from late Sunday night
    through Tuesday evening.

    IMPACTS: High tides will result in flooding of low-lying
    infrastructure, isolated road closures, and coastal erosion.
    Rising tides will bring water and waves farther up the beach
    than normal, restricting escape from beaches and coastal areas. Waves
    can sweep across the shoreline without warning, pulling people
    into the sea from beaches, jetties, and rocks.

    ADDITIONAL DETAILS: At the San Francisco tidal gauge, high tide
    is expected to be 1.0 ft above normal (6.8 ft MLLW) on Sunday
    11/01 at 3:59 PM. These predictions include up to 1.5 ft of
    surge that will enhance the astronomical tide and flooding
    threat. High tide varies up to 90 minutes earlier or later along
    the Pacific Coast and through the San Francisco Bay,
    respectively.

    PRECAUTIONARY / PREPAREDNESS ACTIONS:

    If travel is required, allow extra time as some roads may be
    closed. Do not drive around barricades or through water of
    unknown depth. Take the necessary actions to protect flood-prone
    property.

    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.

    &&

    Coastal Flood Advisory - 5:58pm Sat Oct 31 2026

    ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 6 PM PDT SUNDAY... ...BEACH HAZARDS STATEMENT IN EFFECT FROM LATE SUNDAY NIGHT THROUGH TUESDAY EVENING...

    WHAT: For the Coastal Flood Advisory, Up to 1.5 ft of
    inundation above ground level is possible in low-lying areas
    near shorelines and tidal waterways. For the Beach Hazards
    Statement, An increased risk for sneaker waves and strong rip
    currents.

    WHERE: San Francisco, Northern Monterey Bay and Southern
    Monterey Bay and Big Sur Coast Counties.

    WHEN: For the Coastal Flood Advisory, until 6 PM PDT Sunday.
    For the Beach Hazards Statement, from late Sunday night
    through Tuesday evening.

    IMPACTS: High tides will result in flooding of low-lying
    infrastructure, isolated road closures, and coastal erosion.
    Rising tides will bring water and waves farther up the beach
    than normal, restricting escape from beaches and coastal areas. Waves
    can sweep across the shoreline without warning, pulling people
    into the sea from beaches, jetties, and rocks.

    ADDITIONAL DETAILS: At the San Francisco tidal gauge, high tide
    is expected to be 1.0 ft above normal (6.8 ft MLLW) on Sunday
    11/01 at 3:59 PM. These predictions include up to 1.5 ft of
    surge that will enhance the astronomical tide and flooding
    threat. High tide varies up to 90 minutes earlier or later along
    the Pacific Coast and through the San Francisco Bay,
    respectively.

    PRECAUTIONARY / PREPAREDNESS ACTIONS:

    If travel is required, allow extra time as some roads may be
    closed. Do not drive around barricades or through water of
    unknown depth. Take the necessary actions to protect flood-prone
    property.

    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.

    &&

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