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Alcatraz Island, San Francisco Bay, CA 94133 (415) 561-4900Quick Weather Clicks
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Alcatraz Weather Forecast
| REST OF TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY |
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| Sunny | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Hi: 76°FHi: 24°C Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C Lo: 59°FLo: 15°C | Lo: 60°FLo: 16°C | Hi: 76°FHi: 24°C Lo: 60°FLo: 16°C | Hi: 76°FHi: 24°C Lo: 60°FLo: 16°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1102 AM PDT Sat Aug 22 2026 
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Issued: 105 PM PDT Sat Aug 22 2026
Key Messages
Updated at 103 PM PDT Sat Aug 22 2026- Near to slightly below normal temperatures within the marine layer through the extended forecast
- Warm and dry conditions persist above 1000 feet
Aviation
... (18Z TAFS) Issued at 1212 PM PDT Sat Aug 22 2026
VFR through the afternoon with diurnally influenced and moderate onshore flow. The OAK sounding from this morning measured the marine layer at a depth of 1500 feet which is consistent with the past couple of nights. However, due to dry air entrai...