Alcatraz Island, CA Weather Forecast and Current Conditions

Day	Sky	High / Low	Precip	Wind	Humidity
Mon Sep 21	Mostly Cloudy Close Hourly	64º / 56º	20%	SW 16 mph	87%
4am	Cloudy	57º	15%	WSW 7 mph	96%
5am	Cloudy	57º	15%	WSW 7 mph	96%
6am	Cloudy	57º	15%	SW 7 mph	95%
7am	Cloudy	57º	15%	SW 8 mph	94%
8am	Cloudy	58º	15%	SW 8 mph	92%
9am	Cloudy	59º	17%	SW 9 mph	93%
10am	Cloudy	60º	18%	SW 9 mph	90%
11am	Mostly Cloudy	61º	20%	SW 10 mph	87%
12pm	Cloudy	62º	20%	SW 11 mph	83%
1pm	Mostly Cloudy	63º	6%	SW 13 mph	79%
2pm	Mostly Cloudy	64º	8%	SW 15 mph	77%
3pm	Mostly Cloudy	64º	7%	SW 16 mph	78%
4pm	Mostly Cloudy	64º	9%	SW 16 mph	78%
5pm	Mostly Cloudy	63º	10%	WSW 15 mph	79%
6pm	Mostly Cloudy	62º	20%	SW 14 mph	81%
7pm	Cloudy	61º	20%	SW 13 mph	85%
8pm	Cloudy	60º	23%	SW 12 mph	88%
9pm	Cloudy	59º	23%	SW 11 mph	90%
10pm	Cloudy	59º	24%	SW 11 mph	90%
11pm	Cloudy	59º	23%	SW 10 mph	90%
Tue Sep 22	AM Clouds/PM Sun View Hourly	68º / 56º	22%	SW 13 mph	81%
12am	Cloudy	59º	17%	SW 9 mph	90%
1am	Cloudy	59º	24%	SW 9 mph	90%
2am	Mostly Cloudy	59º	18%	SW 8 mph	90%
3am	Cloudy	58º	18%	SSW 8 mph	91%
4am	Mostly Cloudy	58º	19%	SSW 8 mph	93%
5am	Cloudy	58º	18%	SSW 7 mph	92%
6am	Cloudy	57º	18%	SW 6 mph	93%
7am	Cloudy	57º	23%	SW 6 mph	93%
8am	Cloudy	58º	21%	SSW 6 mph	92%
9am	Cloudy	59º	15%	SSW 6 mph	91%
10am	Cloudy	60º	14%	SSW 6 mph	89%
11am	Mostly Cloudy	62º	15%	SSW 6 mph	85%
12pm	Mostly Cloudy	63º	14%	SSW 7 mph	81%
1pm	Partly Cloudy	65º	14%	SW 9 mph	77%
2pm	Partly Cloudy	66º	5%	SW 11 mph	73%
3pm	Partly Cloudy	67º	4%	SW 12 mph	70%
4pm	Sunny	67º	4%	SW 13 mph	71%
5pm	Sunny	67º	4%	SW 12 mph	72%
6pm	Sunny	66º	5%	SW 12 mph	75%
7pm	Sunny	64º	6%	SW 10 mph	79%
8pm	Clear	62º	7%	SW 9 mph	84%
9pm	Clear	61º	8%	SSW 8 mph	87%
10pm	Mostly Clear	60º	8%	S 7 mph	89%
11pm	Mostly Clear	60º	12%	S 6 mph	90%
Wed Sep 23	AM Fog/PM Sun View Hourly	78º / 56º	20%	W 11 mph	72%
12am	Partly Cloudy	59º	12%	SSE 6 mph	90%
1am	Partly Cloudy	59º	12%	SSE 5 mph	92%
2am	Partly Cloudy	58º	11%	S 5 mph	92%
3am	Partly Cloudy	58º	11%	SSE 4 mph	93%
Thu Sep 24	Partly Cloudy	75º / 58º	6%	SW 13 mph	69%
Fri Sep 25	Partly Cloudy	73º / 55º	19%	W 14 mph	72%
Sat Sep 26	Partly Cloudy	70º / 55º	6%	WSW 13 mph	72%
Sun Sep 27	Mostly Sunny	71º / 55º	6%	WSW 13 mph	70%
Mon Sep 28	Sunny	75º / 56º	6%	W 12 mph	64%

Buoy Data
For Alcatraz Island, CA
Wind Forecast
In Alcatraz Island, CA
Radar
In Alcatraz Island, CA
Marine Forecast
In Alcatraz Island, CA

NOAA Weather Marine Forecast for Alcatraz Island, CA

Overnight

Low : 58ºF
WSW wind 10 to 14 kt. Mostly cloudy.

Monday

High : 60ºF
WSW wind 10 to 17 kt. Cloudy, then gradually becoming mostly sunny.

Monday Night

Low : 58ºF
WSW wind 9 to 16 kt. Mostly cloudy.

Tuesday

High : 62ºF
SSW wind 6 to 13 kt. Mostly cloudy, then gradually becoming sunny.

Tuesday Night

Low : 58ºF
WSW wind 7 to 14 kt. Mostly clear.

Wednesday

High : 68ºF
Variable winds less than 5 kt becoming W 5 to 9 kt in the afternoon. Patchy fog between 11am and noon.

Wednesday Night

Low : 59ºF
W wind 7 to 12 kt becoming variable and less than 5 kt after midnight. Mostly clear.

Thursday

High : 67ºF
Variable winds less than 5 kt becoming WSW 8 to 13 kt in the afternoon. Mostly sunny.

Thursday Night

Low : 60ºF
W wind 9 to 14 kt, with gusts as high as 20 kt. Partly cloudy.

Current Weather Conditions In Alcatraz Island, CA

As Of: 14 minutes ago

Temperature: 57ºF
Feels Like: 56ºF

Wind Speed: 7mph
Direction: 0º (WSW)
Gusts: 7mph

Cloud Cover: Cloudy
Visibility: 6mi

Pressure: 29.92"
Humidity: 96%
Dew Point: 0ºF

The weather right now in Alcatraz Island, CA is Cloudy. The current temperature is 57°F, and the expected high and low for today, Monday, September 21, 2026, are 64° high temperature and 56°F low temperature. The wind is currently blowing at 7 miles per hour, and coming from the West Southwest. The wind is gusting to 7 mph. With the wind and the atmosphere the temperature feels like 56° Fahrenheit. Expected precipitation is 15 percent, with current humidity at 96 percent, and air pressure at 29.92 in. Visibility is 6 nautical miles. There are no current weather alert(s).