Alcatraz Island, CA Weather Forecast and Current Conditions
| Day | Sky | High / Low | Precip | Wind | Humidity | |
|---|---|---|---|---|---|---|
|
Mon Aug 10 |
Partly Cloudy Close Hourly |
66º / 57º | 15% | SW 17 mph | 81% | |
| 7am | Mostly Cloudy | 58º | 15% | SW 7 mph | 91% | |
| 8am | Cloudy | 59º | 15% | SSW 8 mph | 90% | |
| 9am | Cloudy | 60º | 6% | SW 9 mph | 87% | |
| 10am | Mostly Cloudy | 61º | 5% | SW 11 mph | 87% | |
| 11am | Mostly Cloudy | 62º | 5% | SW 13 mph | 84% | |
| 12pm | Partly Cloudy | 64º | 5% | SW 14 mph | 80% | |
| 1pm | Partly Cloudy | 65º | 5% | WSW 15 mph | 79% | |
| 2pm | Partly Cloudy | 65º | 9% | SW 16 mph | 76% | |
| 3pm | Mostly Cloudy | 66º | 9% | SW 17 mph | 74% | |
| 4pm | Partly Cloudy | 66º | 5% | SW 17 mph | 73% | |
| 5pm | Partly Cloudy | 66º | 5% | SW 16 mph | 73% | |
| 6pm | Partly Cloudy | 64º | 10% | SW 16 mph | 76% | |
| 7pm | Partly Cloudy | 63º | 8% | SW 15 mph | 80% | |
| 8pm | Partly Cloudy | 61º | 16% | SW 14 mph | 86% | |
| 9pm | Partly Cloudy | 60º | 14% | SW 12 mph | 89% | |
| 10pm | Mostly Cloudy | 59º | 17% | SW 12 mph | 91% | |
| 11pm | Mostly Cloudy | 59º | 17% | SW 11 mph | 93% | |
|
Tue Aug 11 |
Partly Cloudy View Hourly |
67º / 57º | 22% | SW 16 mph | 81% | |
| 12am | Mostly Cloudy | 59º | 23% | SW 10 mph | 91% | |
| 1am | Cloudy | 58º | 24% | SW 9 mph | 93% | |
| 2am | Cloudy | 58º | 19% | SW 9 mph | 94% | |
| 3am | Cloudy | 58º | 15% | SW 9 mph | 93% | |
| 4am | Mostly Cloudy | 58º | 20% | SSW 9 mph | 93% | |
| 5am | Mostly Cloudy | 59º | 20% | SSW 9 mph | 91% | |
| 6am | Mostly Cloudy | 59º | 21% | SW 9 mph | 91% | |
| 7am | Mostly Cloudy | 59º | 20% | SW 9 mph | 92% | |
| 8am | Mostly Cloudy | 60º | 19% | SSW 9 mph | 90% | |
| 9am | Mostly Cloudy | 61º | 23% | SSW 9 mph | 88% | |
| 10am | Cloudy | 62º | 16% | SSW 10 mph | 85% | |
| 11am | Mostly Cloudy | 63º | 12% | SW 11 mph | 82% | |
| 12pm | Mostly Cloudy | 65º | 9% | SW 12 mph | 79% | |
| 1pm | Partly Cloudy | 66º | 9% | SW 14 mph | 77% | |
| 2pm | Partly Cloudy | 66º | 10% | SW 15 mph | 75% | |
| 3pm | Partly Cloudy | 67º | 6% | SW 16 mph | 74% | |
| 4pm | Partly Cloudy | 66º | 5% | SW 16 mph | 74% | |
| 5pm | Partly Cloudy | 65º | 5% | SW 15 mph | 75% | |
| 6pm | Partly Cloudy | 64º | 7% | SW 16 mph | 77% | |
| 7pm | Partly Cloudy | 63º | 13% | SW 15 mph | 81% | |
| 8pm | Mostly Cloudy | 60º | 15% | SW 14 mph | 87% | |
| 9pm | Mostly Cloudy | 60º | 16% | SW 12 mph | 90% | |
| 10pm | Cloudy | 59º | 16% | SW 11 mph | 92% | |
| 11pm | Mostly Cloudy | 59º | 23% | SW 10 mph | 92% | |
|
Wed Aug 12 |
Cloudy View Hourly |
68º / 58º | 17% | SW 16 mph | 81% | |
| 12am | Mostly Cloudy | 59º | 16% | SW 10 mph | 93% | |
| 1am | Mostly Cloudy | 58º | 17% | SW 9 mph | 93% | |
| 2am | Cloudy | 58º | 17% | SW 9 mph | 93% | |
| 3am | Cloudy | 59º | 18% | SSW 9 mph | 92% | |
| 4am | Cloudy | 59º | 17% | SSW 9 mph | 92% | |
| 5am | Cloudy | 59º | 18% | SSW 9 mph | 91% | |
| 6am | Cloudy | 59º | 15% | SSW 9 mph | 92% | |
|
Thu Aug 13 |
AM Clouds/PM Sun | 68º / 58º | 8% | SW 16 mph | 78% | |
|
Fri Aug 14 |
AM Clouds/PM Sun | 69º / 58º | 9% | SW 15 mph | 76% | |
|
Sat Aug 15 |
AM Clouds/PM Sun | 69º / 57º | 7% | WSW 14 mph | 77% | |
|
Sun Aug 16 |
AM Clouds/PM Sun | 69º / 57º | 7% | WSW 15 mph | 76% | |
|
Mon Aug 17 |
Partly Cloudy | 70º / 58º | 7% | W 15 mph | 76% | |
-
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
WSW wind 14 to 21 kt, with gusts as high as 30 kt. Partly sunny.
SW wind 10 to 19 kt, with gusts as high as 27 kt. Mostly cloudy.
SW wind 9 to 16 kt. Mostly cloudy, then gradually becoming sunny.
SW wind 10 to 15 kt. Mostly cloudy.
SSW wind 10 to 16 kt. Partly sunny.
SW wind 13 to 17 kt. Mostly cloudy.
SSW wind 11 to 18 kt. Partly sunny.
SW wind 10 to 17 kt. Mostly cloudy.
SW wind 8 to 16 kt. Partly sunny.
NOAA Buoy Data Near Alcatraz Island, CA See Map
Wind Speed Forecast for Alcatraz Island, CA
| Monday | Tuesday | Wednesday | ||||||||||
| Wind Speed (MPH) | 7 | 13 | 17 | 15 | 11 | 9 | 9 | 11 | 16 | 15 | 10 | 9 |
| 2pm | 6pm | 10pm | 2am | 6am | 10am | 2pm | 6pm | 10pm | 2am | 6am | 10am | |
| MPH | 7 | 13 | 17 | 15 | 11 | 9 | 9 | 11 | 16 | 15 | 10 | 9 |
| DIR | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SSW |
Current Weather Conditions In Alcatraz Island, CA
As Of: 20 minutes ago
- 58ºF
- 57ºF
- 7mph
- 0º (SW)
- 7mph
- Mostly Cloudy
- 5mi
- 29.88"
- 91%
- 0ºF
The weather right now in Alcatraz Island, CA is Mostly Cloudy. The current temperature is 58°F, and the expected high and low for today, Monday, August 10, 2026, are 66° high temperature and 57°F low temperature. The wind is currently blowing at 7 miles per hour, and coming from the Southwest. The wind is gusting to 7 mph. With the wind and the atmosphere the temperature feels like 57° Fahrenheit. Expected precipitation is 15 percent, with current humidity at 91 percent, and air pressure at 29.88 in. Visibility is 5 nautical miles. There are 2 current weather alert(s).
...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 9 PM PDT THIS EVENING...
WHAT: Southwest winds 10 to 20 kt with gusts up to 30 kt and
choppy waters.
WHERE: San Pablo Bay, Suisun Bay, the West Delta and the San
Francisco Bay north of the Bay Bridge.
WHEN: Until 9 PM PDT this evening.
IMPACTS: Conditions will be hazardous to small craft.
PRECAUTIONARY / PREPAREDNESS ACTIONS:
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 2 AM PDT THURSDAY...
WHAT: Up to 1.6 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways.
WHERE: Bayshore locations along the San Francisco Bay, San
Pablo Bay, and Monterey Bay.
WHEN: Until 2 AM PDT Thursday.
IMPACTS: Flooding of lots, parks, and roads with only
isolated road closures expected.
ADDITIONAL DETAILS: At the San Francisco tidal gauge, high tide
is expected to be 1.6 ft above normal (7.46 ft MLLW) at 10:01 PM
Monday 8/10, 1.6 ft above normal (7.44 ft MLLW) at 10:57 PM
Tuesday 8/11, and 1.4 ft above normal (7.24 ft MLLW) at 11:49 PM
Wednesday 8/12. These predictions include both astronomical
tides and roughly 3-6 inches of additional water mainly from a
combination of thermal expansion and accumulated sea level rise
since the tidal datum was established (1983-2001). 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.
&&