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Alcatraz Island, CA Marine Weather Forecast

Station PXSC1 - 9414296 - Pier 17, San Francisco Bay, CA

August 17, 2026 9:30 pm PDT
Location: 37.803N 122.397W
Air Temperature: 59.0°F (15.0°C)
Dew Point: 59.0°F (15.0°C)
Visibility: 5.9 nmi


Tonight - 57°F
Aug 18, 2026
6 to 9 mph WSW
Mostly Cloudy
Mostly cloudy, with a low around 57. West southwest wind 6 to 9 mph.
Tuesday - 64°F
Aug 18, 2026
6 to 12 mph WSW
Partly Sunny
Partly sunny. High near 64, with temperatures falling to around 62 in the afternoon. West southwest wind 6 to 12 mph, with gusts as high as 18 mph.
Tuesday Night - 58°F
Aug 18, 2026
6 to 10 mph SW
Mostly Cloudy
Mostly cloudy, with a low around 58. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday - 63°F
Aug 19, 2026
6 to 13 mph SW
Partly Sunny
Partly sunny, with a high near 63. Southwest wind 6 to 13 mph, with gusts as high as 21 mph.
Wednesday Night - 58°F
Aug 19, 2026
8 to 13 mph WSW
Mostly Cloudy
Mostly cloudy, with a low around 58. West southwest wind 8 to 13 mph, with gusts as high as 21 mph.
Thursday - 62°F
Aug 20, 2026
8 to 13 mph WSW
Partly Sunny
Partly sunny, with a high near 62.
Thursday Night - 58°F
Aug 20, 2026
8 to 13 mph WSW
Mostly Cloudy
Mostly cloudy, with a low around 58.
Friday - 62°F
Aug 21, 2026
8 to 14 mph WSW
Partly Sunny
Partly sunny, with a high near 62.
Friday Night - 58°F
Aug 21, 2026
7 to 14 mph WSW
Partly Cloudy
Partly cloudy, with a low around 58.
Saturday - 62°F
Aug 22, 2026
7 to 12 mph WSW
Mostly Sunny
Mostly sunny, with a high near 62.
Saturday Night - 58°F
Aug 22, 2026
8 to 12 mph WSW
Partly Cloudy
Partly cloudy, with a low around 58.
Sunday - 62°F
Aug 23, 2026
7 to 12 mph WSW
Mostly Sunny
Mostly sunny, with a high near 62.
Sunday Night - 58°F
Aug 23, 2026
8 to 12 mph WSW
Mostly Cloudy
Mostly cloudy, with a low around 58.
Monday - 61°F
Aug 24, 2026
8 to 13 mph WSW
Partly Sunny
Partly sunny, with a high near 61.

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