Castle Island, Boston Harbor 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 07:07 AM and sunset is at 04:13 PM.
Days 1–3 Weather SummaryModerate rain (total 17mm) heaviest on Fri morning, then becoming colder with a dusting of snow on Fri night. Icy conditions (max 15°C on Fri morning, min -2°C on Fri night). Winds increasing (light winds from the S on Thu morning, strong winds from the S by Fri morning). | Days 4–6 Weather SummaryA dusting of new snow. Icy conditions (max 7°C on Sun morning, min -5°C on Sun night). Wind will be generally light. | Days 7–9 Weather SummaryA dusting of snow turning to light rain (total 2mm) on Fri afternoon. Freeze-thaw conditions (max 6°C on Fri night, min -6°C on Wed night). Wind will be generally light. | Days 10–12 Weather SummaryMostly dry. Freeze-thaw conditions (max 2°C on Mon morning, min -6°C on Sat night). Wind will be generally light. | |||||||||||||||||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thursday 25 | Friday 26 | Saturday 27 | Sunday 28 | Monday 29 | |||||||||||||||||||||||||
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 | PM | night | |
Wave Height Map |  |  |  |  |  |  |  |  |  |  |  |  | ||||||||||||||||||||||||
High Tide | 9:52AM2.97m | 10:32PM2.58m | 10:32AM3.00m | 11:12PM2.59m | 11:11AM3.02m | 11:51PM2.60m | 11:50AM3.03m | 00:30AM2.61m | 12:29PM3.02m | 1:10AM2.62m | 1:10PM3.00m | 1:50AM2.65m | 1:53PM2.97m | 2:33AM2.69m | 2:39PM2.92m | 3:18AM2.76m | 3:29PM2.87m | 4:05AM2.84m | 4:23PM2.81m | 4:56AM2.95m | 5:21PM2.77m | 5:50AM3.07m | 6:22PM2.76m | 6:45AM3.20m | ||||||||||||
Low Tide | 4:20PM0.15m | 4:19AM0.47m | 5:00PM0.11m | 5:00AM0.45m | 5:38PM0.09m | 5:40AM0.44m | 6:17PM0.07m | 6:21AM0.43m | 6:57PM0.06m | 7:03AM0.42m | 7:37PM0.06m | 7:47AM0.41m | 8:19PM0.07m | 8:33AM0.40m | 9:04PM0.09m | 9:24AM0.36m | 9:51PM0.11m | 10:18AM0.30m | 10:42PM0.14m | 11:16AM0.22m | 11:35PM0.16m | 12:16PM0.09m | 00:31AM0.16m | |||||||||||||
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clear | clear | cloudy | heavy rain | rain shwrs | snow shwrs | clear | cloudy | cloudy | clear | some clouds | clear | clear | clear | cloudy | light snow | some clouds | clear | clear | clear | clear | some clouds | some clouds | some clouds | light snow | light rain | some clouds | clear | clear | clear | clear | some clouds | some clouds | clear | clear | some clouds | |
km/h | ||||||||||||||||||||||||||||||||||||
— | — | — | 11 | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | |
max°C | 5 | 5 | 14 | 15 | 10 | 1 | 2 | 2 | 5 | 7 | 3 | -1 | -3 | -3 | -2 | 2 | 1 | 2 | 1 | -2 | -5 | 0 | 1 | 0 | 1 | 2 | 6 | -1 | -2 | -5 | -2 | -1 | -1 | 2 | 2 | 0 |
Moonrise | 6:11 | — | — | 7:09 | — | — | 8:01 | — | — | 8:45 | — | — | 9:21 | — | — | 9:51 | — | — | 10:16 | — | — | 10:38 | — | — | 10:58 | — | — | 11:19 | — | — | 11:41 | — | — | 12:07 | — | — |
Moonset | 2:45 | — | — | — | 3:32 | — | — | 4:28 | — | — | 5:30 | — | — | 6:37 | — | — | 7:45 | — | — | 8:53 | — | — | — | 10:02 | — | — | 11:11 | — | — | — | 12:22 | — | — | 1:36 | — | — |
 | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:09 | — | — | 7:09 | — | — | 7:09 | — | — | 7:11 | — | — | 7:11 | — | — | 7:11 | — | — | 7:11 | — | — | 7:11 | — | — | 7:11 | — | — |
 | — | 4:13 | — | — | 4:13 | — | — | 4:14 | — | — | 4:14 | — | — | 4:15 | — | — | 4:15 | — | — | 4:15 | — | — | 4:15 | — | — | 4:16 | — | — | 4:17 | — | — | 4:17 | — | — | 4:19 | — |
Today's sea temperature in Castle Island, Boston Harbor is 6.2° C (Statistics for 18 Dec 1981-2005 – mean: 7.5 max: 9.9 min: 5.7°C) | ||||||||||||||||||||||||||||||||||||
Nearest