Alcatraz Island, San Francisco Bay Sea Conditions table showing wave height, swell direction and period.
High and low tide times are also provided on the table along with the moon phase and forecast weather. Sunrise today is at — and sunset is at 04:52 PM.
Days 1–4 Weather SummaryHeavy rain (total 50mm), heaviest during Sat afternoon. Cool air temperatures (max 16°C on Fri morning, min 13°C on Thu afternoon). Wind will be generally light. | Days 5–7 Weather SummaryHeavy rain (total 71mm), heaviest during Mon night. Cool air temperatures (max 15°C on Sun afternoon, min 11°C on Mon night). Winds increasing (calm on Mon morning, strong winds from the S by Tue afternoon). | Days 8–10 Weather SummaryHeavy rain (total 58mm), heaviest during Wed night. Very mild (max 14°C on Wed afternoon, min 10°C on Fri night). Winds decreasing (strong winds from the SSE on Wed afternoon, calm by Fri night). | Days 11–13 Weather SummaryHeavy rain (total 22mm), heaviest during Mon afternoon. Very mild (max 12°C on Sat afternoon, min 10°C on Sat night). Wind will be generally light. | |||||||||||||||||||||||||||||||||
Thu 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thursday 25 | Friday 26 | Saturday 27 | Sunday 28 | Monday 29 | Tue 30 | ||||||||||||||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | |
Wave Height Map |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||||||||||||||||
High Tide | 00:24AM1.40m | 10:19AM1.87m | 1:01AM1.41m | 10:55AM1.86m | 1:36AM1.41m | 11:32AM1.84m | 2:11AM1.41m | 12:10PM1.80m | 2:45AM1.42m | 12:51PM1.73m | 3:20AM1.45m | 1:35PM1.62m | 3:56AM1.49m | 2:28PM1.48m | 4:32AM1.56m | 3:34PM1.32m | 5:09AM1.66m | 5:01PM1.19m | 5:49AM1.76m | 6:44PM1.14m | 6:31AM1.88m | 8:19PM1.19m | 7:17AM1.99m | |||||||||||||
Low Tide | 4:59PM-0.15m | 4:34AM1.05m | 5:33PM-0.18m | 5:11AM1.06m | 6:07PM-0.20m | 5:47AM1.06m | 6:41PM-0.21m | 6:25AM1.04m | 7:16PM-0.20m | 7:08AM1.02m | 7:53PM-0.17m | 7:59AM0.98m | 8:31PM-0.09m | 9:01AM0.91m | 9:12PM0.03m | 10:13AM0.79m | 9:56PM0.20m | 11:27AM0.60m | 10:46PM0.39m | 12:35PM0.37m | 11:42PM0.59m | 1:35PM0.12m | 00:42AM0.76m | |||||||||||||
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 |  | |  |  | |  |  | |  | | | | | |  | |  | | | | |  | | |  | | |  | | |  | | | | | |
some clouds | cloudy | some clouds | light rain | mod rain | light rain | mod rain | heavy rain | light rain | cloudy | cloudy | cloudy | light rain | heavy rain | mod rain | heavy rain | heavy rain | clear | cloudy | heavy rain | mod rain | light rain | rain shwrs | clear | clear | clear | some clouds | some clouds | some clouds | some clouds | cloudy | light rain | light rain | mod rain | rain shwrs | clear | |
km/h | ||||||||||||||||||||||||||||||||||||
— | — | — | 5 | 7 | 5 | 8 | 21 | 4 | — | — | — | 2 | 32 | 9 | 12 | 16 | — | — | 40 | 7 | 5 | 6 | — | — | — | — | — | — | — | — | 3 | 3 | 10 | 6 | — | |
max°C | 13 | 14 | 16 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 14 | 13 | 12 | 15 | 15 | 15 | 14 | 14 | 14 | 12 | 13 | 13 | 14 | 14 | 13 | 12 | 11 | 12 | 11 | 12 | 12 | 12 | 12 | 12 | 11 | 11 |
Moonrise | — | — | 7:23 | — | — | 8:15 | — | — | 8:59 | — | — | 9:37 | — | — | 10:09 | — | — | 10:37 | — | — | 11:02 | — | — | 11:26 | — | — | 11:50 | — | — | 12:16 | — | — | 12:46 | — | — | 1:23 |
Moonset | 3:36 | — | — | 4:25 | — | — | 5:21 | — | — | 6:22 | — | — | 7:26 | — | — | 8:31 | — | — | — | 9:35 | — | — | 10:40 | — | — | 11:46 | — | — | — | 12:53 | — | — | 2:04 | — | — | 3:19 |
 | — | — | 7:20 | — | — | 7:20 | — | — | 7:20 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 |
 | 4:52 | — | — | 4:52 | — | — | 4:52 | — | — | 4:53 | — | — | 4:53 | — | — | 4:54 | — | — | 4:54 | — | — | 4:55 | — | — | 4:57 | — | — | 4:57 | — | — | 4:58 | — | — | 4:59 | — | — |
Today's sea temperature in Alcatraz Island, San Francisco Bay is 12.0° C (Statistics for 18 Dec 1981-2005 – mean: 12.4 max: 14.8 min: 11.1°C) | ||||||||||||||||||||||||||||||||||||
Nearest