Alcatraz Island, CA Weather Forecast and Current Conditions
| Day | Sky | High / Low | Precip | Wind | Humidity | |
|---|---|---|---|---|---|---|
|
Mon Jul 20 |
 |
Light Rain | -º / 58º | 89% | SW 5 mph | 89% |
|
Tue Jul 21 |
 |
Partly Cloudy View Hourly |
76º / 63º | 9% | SW 14 mph | 68% |
| 2am |  |
Mostly Cloudy | 60º | 15% | WSW 5 mph | 89% |
| 3am |  |
Cloudy | 60º | 15% | WSW 5 mph | 89% |
| 4am | |
Cloudy | 59º | 15% | WSW 4 mph | 91% |
| 5am | |
Cloudy | 59º | 15% | WSW 4 mph | 90% |
| 6am | |
Cloudy | 58º | 15% | WSW 4 mph | 92% |
| 7am |  |
Mostly Cloudy | 59º | 7% | SW 4 mph | 91% |
| 8am | |
Mostly Cloudy | 60º | 8% | SSW 4 mph | 89% |
| 9am | |
Mostly Cloudy | 62º | 9% | S 4 mph | 85% |
| 10am | |
Mostly Cloudy | 64º | 7% | SW 5 mph | 80% |
| 11am | |
Mostly Cloudy | 68º | 4% | SW 6 mph | 71% |
| 12pm | |
Partly Cloudy | 71º | 3% | SW 8 mph | 63% |
| 1pm | |
Partly Cloudy | 73º | 2% | WSW 11 mph | 60% |
| 2pm | |
Partly Cloudy | 74º | 2% | WSW 13 mph | 56% |
| 3pm |  |
Mostly Sunny | 73º | 2% | WSW 14 mph | 55% |
| 4pm | |
Mostly Sunny | 74º | 2% | WSW 14 mph | 54% |
| 5pm | |
Mostly Sunny | 74º | 2% | WSW 14 mph | 52% |
| 6pm |  |
Sunny | 72º | 2% | WSW 14 mph | 55% |
| 7pm | |
Sunny | 70º | 3% | WSW 12 mph | 62% |
| 8pm | |
Mostly Sunny | 68º | 5% | WSW 12 mph | 69% |
| 9pm |  |
Partly Cloudy | 67º | 6% | WSW 11 mph | 73% |
| 10pm | |
Mostly Cloudy | 65º | 23% | WSW 10 mph | 81% |
| 11pm | |
Mostly Cloudy | 64º | 16% | WSW 10 mph | 84% |
|
Wed Jul 22 |
|
Mostly Cloudy View Hourly |
70º / 58º | 14% | WSW 15 mph | 82% |
| 12am | |
Cloudy | 64º | 18% | WSW 9 mph | 88% |
| 1am | |
Mostly Cloudy | 64º | 21% | SW 8 mph | 89% |
| 2am | |
Mostly Cloudy | 64º | 19% | WSW 8 mph | 89% |
| 3am | |
Cloudy | 64º | 19% | SW 8 mph | 90% |
| 4am | |
Cloudy | 64º | 19% | SW 8 mph | 90% |
| 5am | |
Cloudy | 64º | 18% | SW 8 mph | 90% |
| 6am | |
Cloudy | 64º | 19% | SW 9 mph | 90% |
| 7am | |
Cloudy | 64º | 11% | SW 8 mph | 91% |
| 8am | |
Cloudy | 64º | 8% | SW 8 mph | 90% |
| 9am | |
Cloudy | 65º | 8% | SW 9 mph | 89% |
| 10am | |
Cloudy | 66º | 14% | SW 10 mph | 85% |
| 11am | |
Cloudy | 67º | 15% | SW 11 mph | 84% |
| 12pm | |
Mostly Cloudy | 68º | 12% | SW 12 mph | 80% |
| 1pm | |
Cloudy | 69º | 6% | WSW 13 mph | 78% |
| 2pm | |
Mostly Cloudy | 70º | 6% | WSW 14 mph | 75% |
| 3pm | |
Mostly Cloudy | 70º | 6% | WSW 15 mph | 77% |
| 4pm | |
Mostly Cloudy | 69º | 7% | WSW 15 mph | 78% |
| 5pm | |
Mostly Cloudy | 68º | 8% | WSW 15 mph | 78% |
| 6pm | |
Mostly Cloudy | 68º | 14% | WSW 14 mph | 80% |
| 7pm | |
Cloudy | 66º | 16% | W 13 mph | 82% |
| 8pm | |
Mostly Cloudy | 65º | 15% | W 13 mph | 86% |
| 9pm | |
Cloudy | 63º | 14% | W 11 mph | 90% |
| 10pm | |
Mostly Cloudy | 63º | 10% | W 9 mph | 90% |
| 11pm | |
Mostly Cloudy | 62º | 9% | W 8 mph | 92% |
|
Thu Jul 23 |
 |
AM Fog/PM Sun View Hourly |
72º / 56º | 22% | W 15 mph | 76% |
| 12am | |
Cloudy | 62º | 21% | W 8 mph | 91% |
| 1am | |
Foggy | 61º | 21% | W 7 mph | 93% |
|
Fri Jul 24 |
|
Partly Cloudy | 74º / 58º | 20% | W 15 mph | 69% |
|
Sat Jul 25 |
|
Partly Cloudy | 74º / 57º | 7% | W 15 mph | 69% |
|
Sun Jul 26 |
|
Mostly Sunny | 73º / 57º | 19% | WSW 15 mph | 71% |
|
Mon Jul 27 |
|
Sunny | 73º / 57º | 6% | WSW 15 mph | 70% |
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Buoy Data
For Alcatraz Island, CA -
Wind Forecast
In Alcatraz Island, CA -
Radar
In Alcatraz Island, CA -
Marine Forecast
In Alcatraz Island, CA
Weather Radar for Alcatraz Island, CA See Radar
* Playback displays weather for the past 6 hours.
NOAA Weather Marine Forecast for Alcatraz Island, CA
Tonight
Low : 57ºF
WSW wind around 6 kt becoming variable and less than 5 kt after midnight. A slight chance of showers.
WSW wind around 6 kt becoming variable and less than 5 kt after midnight. A slight chance of showers.
Tuesday
High : 64ºF
Variable winds less than 5 kt becoming WSW 8 to 13 kt in the afternoon. A slight chance of showers. Patchy fog between 8am and 11am.
Variable winds less than 5 kt becoming WSW 8 to 13 kt in the afternoon. A slight chance of showers. Patchy fog between 8am and 11am.
Tuesday Night
Low : 59ºF
SW wind 6 to 12 kt. Partly cloudy.
SW wind 6 to 12 kt. Partly cloudy.
Wednesday
High : 63ºF
WSW wind 6 to 16 kt. Mostly sunny.
WSW wind 6 to 16 kt. Mostly sunny.
Wednesday Night
Low : 58ºF
WSW wind 8 to 15 kt. Partly cloudy.
WSW wind 8 to 15 kt. Partly cloudy.
Thursday
High : 61ºF
W wind 8 to 16 kt. Mostly sunny.
W wind 8 to 16 kt. Mostly sunny.
Thursday Night
Low : 57ºF
W wind 11 to 17 kt. Partly cloudy.
W wind 11 to 17 kt. Partly cloudy.
Friday
High : 61ºF
W wind 10 to 16 kt. Mostly sunny.
W wind 10 to 16 kt. Mostly sunny.
Friday Night
Low : 57ºF
WSW wind 11 to 17 kt. Mostly clear.
WSW wind 11 to 17 kt. Mostly clear.
NOAA Buoy Data Near Alcatraz Island, CA See Map
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Wind Speed Forecast for Alcatraz Island, CA
| Tuesday | Wednesday | Thursday | ||||||||||
| Wind Speed (MPH) | 5 | 4 | 5 | 13 | 14 | 10 | 8 | 9 | 10 | 14 | 14 | 9 |
| 9am | 1pm | 5pm | 9pm | 1am | 5am | 9am | 1pm | 5pm | 9pm | 1am | 5am | |
| MPH | 5 | 4 | 5 | 13 | 14 | 10 | 8 | 9 | 10 | 14 | 14 | 9 |
| DIR | WSW | WSW | SW | WSW | WSW | WSW | WSW | SW | SW | WSW | WSW | W |
Current Weather Conditions In Alcatraz Island, CA
As Of: 52 minutes ago
- 60ºF
- 60ºF
- 5mph
- 0º (WSW)
- 5mph
- Mostly Cloudy
- 5mi
- 29.92"
- 89%
- 0ºF
The weather right now in Alcatraz Island, CA is Mostly Cloudy. The current temperature is 60°F, and the expected high and low for today, Tuesday, July 21, 2026, are -° high temperature and 58°F low temperature. The wind is currently blowing at 5 miles per hour, and coming from the West Southwest. The wind is gusting to 5 mph. With the wind and the atmosphere the temperature feels like 60° Fahrenheit. Expected precipitation is 15 percent, with current humidity at 89 percent, and air pressure at 29.92 in. Visibility is 5 nautical miles. There are no current weather alert(s).
