Alcatraz Island, CA Weather Forecast and Current Conditions

Day	Sky	High / Low	Precip	Wind	Humidity
Sun Aug 30	Cloudy	-º / 57º	15%	SW 10 mph	86%
Mon Aug 31	Cloudy View Hourly	66º / 59º	21%	WSW 17 mph	80%
2am	Mostly Cloudy	57º	15%	SW 10 mph	91%
3am	Mostly Cloudy	58º	15%	SW 10 mph	89%
4am	Mostly Cloudy	58º	4%	SW 10 mph	89%
5am	Cloudy	57º	4%	SW 10 mph	91%
6am	Cloudy	58º	4%	WSW 10 mph	90%
7am	Cloudy	58º	18%	WSW 10 mph	91%
8am	Cloudy	58º	20%	WSW 10 mph	90%
9am	Cloudy	59º	21%	WSW 11 mph	87%
10am	Cloudy	60º	21%	WSW 12 mph	86%
11am	Cloudy	61º	8%	WSW 12 mph	83%
12pm	Mostly Cloudy	63º	11%	WSW 13 mph	79%
1pm	Cloudy	64º	8%	WSW 15 mph	78%
2pm	Cloudy	64º	9%	WSW 16 mph	74%
3pm	Mostly Cloudy	65º	8%	W 17 mph	73%
4pm	Mostly Cloudy	65º	7%	WSW 17 mph	74%
5pm	Cloudy	65º	7%	W 17 mph	74%
6pm	Mostly Cloudy	64º	8%	W 16 mph	76%
7pm	Mostly Cloudy	63º	9%	W 16 mph	78%
8pm	Mostly Cloudy	62º	14%	W 15 mph	81%
9pm	Mostly Cloudy	61º	10%	W 13 mph	85%
10pm	Mostly Cloudy	60º	10%	W 14 mph	87%
11pm	Mostly Cloudy	60º	8%	W 12 mph	87%
Tue Sep 1	AM Clouds/PM Sun View Hourly	69º / 59º	23%	WSW 16 mph	72%
12am	Cloudy	60º	9%	W 11 mph	86%
1am	Cloudy	60º	15%	W 10 mph	86%
2am	Cloudy	60º	13%	WSW 10 mph	87%
3am	Cloudy	60º	11%	WSW 9 mph	86%
4am	Cloudy	60º	16%	WSW 9 mph	86%
5am	Mostly Cloudy	60º	15%	WSW 8 mph	86%
6am	Mostly Cloudy	60º	15%	WSW 8 mph	86%
7am	Cloudy	60º	19%	SW 7 mph	86%
8am	Mostly Cloudy	61º	24%	SW 7 mph	86%
9am	Cloudy	62º	12%	WSW 8 mph	81%
10am	Cloudy	63º	11%	WSW 9 mph	77%
11am	Mostly Cloudy	64º	8%	WSW 9 mph	72%
12pm	Mostly Cloudy	66º	5%	WSW 10 mph	68%
1pm	Mostly Cloudy	67º	2%	WSW 12 mph	66%
2pm	Mostly Cloudy	68º	2%	WSW 14 mph	64%
3pm	Cloudy	68º	2%	WSW 15 mph	63%
4pm	Partly Cloudy	68º	3%	WSW 15 mph	64%
5pm	Partly Cloudy	67º	3%	W 16 mph	67%
6pm	Partly Cloudy	66º	4%	W 14 mph	68%
7pm	Mostly Cloudy	65º	5%	W 13 mph	72%
8pm	Mostly Cloudy	63º	6%	W 12 mph	77%
9pm	Cloudy	62º	7%	W 10 mph	82%
10pm	Partly Cloudy	62º	7%	W 10 mph	85%
11pm	Partly Cloudy	61º	7%	WSW 9 mph	88%
Wed Sep 2	AM Clouds/PM Sun View Hourly	71º / 60º	18%	SW 14 mph	75%
12am	Partly Cloudy	61º	8%	WSW 7 mph	87%
1am	Mostly Cloudy	61º	10%	WSW 6 mph	88%
Thu Sep 3	Cloudy	71º / 59º	20%	SW 13 mph	79%
Fri Sep 4	Partly Cloudy	71º / 57º	12%	W 15 mph	73%
Sat Sep 5	Mostly Sunny	73º / 56º	19%	W 15 mph	67%
Sun Sep 6	Partly Cloudy	73º / 56º	15%	W 14 mph	67%

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

Monday

High : 58ºF
WSW wind 13 to 20 kt. Partly sunny.

Monday Night

Low : 56ºF
WSW wind 12 to 20 kt. Mostly cloudy.

Tuesday

High : 59ºF
SW wind 10 to 17 kt. Partly sunny.

Tuesday Night

Low : 57ºF
WSW wind 12 to 17 kt decreasing to 5 to 10 kt after midnight. Partly cloudy.

Wednesday

High : 60ºF
S wind 5 to 15 kt becoming WSW in the afternoon. Mostly sunny.

Wednesday Night

Low : 57ºF
WSW wind 11 to 16 kt becoming variable and less than 5 kt after midnight. Mostly cloudy.

Thursday

High : 61ºF
SW wind 5 to 15 kt. Partly sunny.

Thursday Night

Low : 58ºF
W wind 6 to 13 kt. Partly cloudy.

Friday

High : 60ºF
WSW wind 6 to 15 kt. Mostly sunny.

Current Weather Conditions In Alcatraz Island, CA

As Of: 30 minutes ago

Temperature: 57ºF
Feels Like: 55ºF

Wind Speed: 10mph
Direction: 0º (SW)
Gusts: 10mph

Cloud Cover: Mostly Cloudy
Visibility: 5mi

Pressure: 29.89"
Humidity: 91%
Dew Point: 0ºF

The weather right now in Alcatraz Island, CA is Mostly Cloudy. The current temperature is 57°F, and the expected high and low for today, Monday, August 31, 2026, are -° high temperature and 57°F low temperature. The wind is currently blowing at 10 miles per hour, and coming from the Southwest. The wind is gusting to 10 mph. With the wind and the atmosphere the temperature feels like 55° Fahrenheit. Expected precipitation is 15 percent, with current humidity at 91 percent, and air pressure at 29.89 in. Visibility is 5 nautical miles. There are no current weather alert(s).