Alcatraz Island, CA Weather Forecast and Current Conditions
| Day | Sky | High / Low | Precip | Wind | Humidity | |
|---|---|---|---|---|---|---|
|
Wed Jun 10 |
 |
Clear Close Hourly |
-º / 58º | 4% | SSW 11 mph | 71% |
| 8pm |  |
Sunny | 66º | 1% | SW 10 mph | 62% |
| 9pm | |
Clear | 64º | 1% | SSW 8 mph | 66% |
| 10pm | |
Clear | 62º | 2% | SSW 8 mph | 70% |
| 11pm | |
Clear | 61º | 2% | SSW 6 mph | 74% |
|
Thu Jun 11 |
|
Sunny View Hourly |
79º / 57º | 3% | SW 15 mph | 54% |
| 12am | |
Clear | 60º | 2% | SSW 5 mph | 76% |
| 1am | |
Clear | 60º | 2% | SSW 4 mph | 76% |
| 2am | |
Clear | 59º | 2% | SSW 3 mph | 77% |
| 3am | |
Clear | 59º | 5% | S 3 mph | 76% |
| 4am | |
Clear | 60º | 5% | S 3 mph | 75% |
| 5am | |
Clear | 59º | 5% | SSW 3 mph | 75% |
| 6am | |
Sunny | 59º | 5% | SSW 3 mph | 76% |
| 7am | |
Sunny | 60º | 3% | SW 3 mph | 75% |
| 8am | |
Sunny | 63º | 2% | S 2 mph | 68% |
| 9am | |
Sunny | 67º | 1% | SSW 3 mph | 62% |
| 10am | |
Sunny | 70º | 1% | WSW 5 mph | 56% |
| 11am | |
Sunny | 74º | 1% | WSW 7 mph | 49% |
| 12pm | |
Sunny | 77º | 1% | WSW 9 mph | 43% |
| 1pm | |
Sunny | 78º | 1% | WSW 12 mph | 41% |
| 2pm | |
Sunny | 75º | 1% | WSW 14 mph | 45% |
| 3pm | |
Sunny | 73º | 1% | WSW 15 mph | 48% |
| 4pm | |
Sunny | 72º | 1% | WSW 15 mph | 49% |
| 5pm |  |
Mostly Sunny | 70º | 1% | WSW 15 mph | 52% |
| 6pm | |
Sunny | 69º | 1% | WSW 15 mph | 55% |
| 7pm | |
Sunny | 67º | 1% | WSW 13 mph | 59% |
| 8pm | |
Sunny | 65º | 2% | SW 11 mph | 64% |
| 9pm | |
Clear | 62º | 4% | SW 9 mph | 71% |
| 10pm | |
Clear | 61º | 5% | SW 9 mph | 75% |
| 11pm | |
Clear | 60º | 6% | SW 8 mph | 79% |
|
Fri Jun 12 |
 |
Partly Cloudy View Hourly |
69º / 55º | 19% | WSW 15 mph | 73% |
| 12am |  |
Mostly Clear | 59º | 6% | SW 8 mph | 82% |
| 1am |  |
Partly Cloudy | 59º | 7% | SW 7 mph | 83% |
| 2am | |
Partly Cloudy | 59º | 7% | WSW 7 mph | 84% |
| 3am | |
Partly Cloudy | 58º | 20% | SW 7 mph | 85% |
| 4am | |
Partly Cloudy | 58º | 20% | SW 6 mph | 85% |
| 5am | |
Partly Cloudy | 58º | 20% | WSW 6 mph | 86% |
| 6am | |
Partly Cloudy | 58º | 20% | WSW 6 mph | 87% |
| 7am | |
Partly Cloudy | 59º | 20% | WSW 6 mph | 85% |
| 8am | |
Partly Cloudy | 61º | 6% | WSW 5 mph | 80% |
| 9am | |
Mostly Sunny | 62º | 5% | WSW 5 mph | 77% |
| 10am | |
Mostly Sunny | 64º | 4% | W 6 mph | 74% |
| 11am | |
Partly Cloudy | 65º | 3% | W 9 mph | 72% |
| 12pm | |
Partly Cloudy | 66º | 3% | WSW 10 mph | 69% |
| 1pm | |
Partly Cloudy | 68º | 3% | W 12 mph | 66% |
| 2pm | |
Partly Cloudy | 68º | 2% | WSW 14 mph | 66% |
| 3pm | |
Partly Cloudy | 66º | 3% | WSW 15 mph | 68% |
| 4pm | |
Partly Cloudy | 66º | 3% | WSW 15 mph | 69% |
| 5pm | |
Partly Cloudy | 65º | 4% | WSW 15 mph | 70% |
| 6pm | |
Partly Cloudy | 63º | 5% | WSW 14 mph | 74% |
| 7pm | |
Partly Cloudy | 62º | 6% | WSW 12 mph | 77% |
|
Sat Jun 13 |
|
Mostly Sunny | 69º / 56º | 19% | WSW 15 mph | 73% |
|
Sun Jun 14 |
|
Mostly Sunny | 70º / 55º | 7% | WSW 15 mph | 72% |
|
Mon Jun 15 |
|
Mostly Sunny | 69º / 55º | 11% | WSW 15 mph | 73% |
|
Tue Jun 16 |
 |
AM Fog/PM Sun | 69º / 56º | 19% | WSW 15 mph | 74% |
|
Wed Jun 17 |
|
Partly Cloudy | 68º / 55º | 19% | WSW 16 mph | 74% |
-
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
W wind 5 to 10 kt becoming variable and less than 5 kt after midnight. Clear.
Variable winds less than 5 kt becoming WSW 9 to 14 kt in the afternoon. Sunny.
SW wind 8 to 13 kt. Mostly clear.
Variable winds less than 5 kt becoming WSW 9 to 14 kt in the afternoon. Sunny.
SW wind 8 to 13 kt. Partly cloudy.
WSW wind 5 to 13 kt. Sunny.
SW wind 7 to 13 kt. Mostly clear.
SW wind 6 to 13 kt. Mostly sunny.
SW wind 6 to 13 kt. Partly cloudy.
NOAA Buoy Data Near Alcatraz Island, CA See Map
Wind Speed Forecast for Alcatraz Island, CA
| Thursday | Friday | |||||||||||
| Wind Speed (MPH) | 10 | 5 | 3 | 2 | 9 | 15 | 11 | 8 | 6 | 5 | 10 | 15 |
| 3am | 7am | 11am | 3pm | 7pm | 11pm | 3am | 7am | 11am | 3pm | 7pm | 11pm | |
| MPH | 10 | 5 | 3 | 2 | 9 | 15 | 11 | 8 | 6 | 5 | 10 | 15 |
| DIR | SW | SSW | S | S | WSW | WSW | SW | SW | SW | WSW | WSW | WSW |
Current Weather Conditions In Alcatraz Island, CA
As Of: 9 minutes ago
- 66ºF
- 66ºF
- 10mph
- 0º (SW)
- 10mph
- Sunny
- 9mi
- 29.79"
- 62%
- 0ºF
The weather right now in Alcatraz Island, CA is Sunny. The current temperature is 66°F, and the expected high and low for today, Wednesday, June 10, 2026, are -° high temperature and 58°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 66° Fahrenheit. Expected precipitation is 1 percent, with current humidity at 62 percent, and air pressure at 29.79 in. Visibility is 9 nautical miles. There are 1 current weather alert(s).
...COASTAL FLOOD ADVISORY NOW IN EFFECT FROM 7 PM THURSDAY TO 7 PM PDT FRIDAY...
WHAT: Up to 1.5 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways.
WHERE: Bayshore regions near the San Francisco Bay.
WHEN: From 7 PM Thursday to 7 PM PDT Friday.
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 1.2 ft above normal (6.98 ft MLLW) at
8:51 PM on Thursday the 11th, and 1.5 ft above normal (7.23 ft
MLLW) at 9:34 PM on Friday the 12th. 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.
&&
