Castle Island, Boston Harbor Sea Conditions and Tide Table

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 06:30 AM and sunset is at 07:07 PM.

Days 1–3 Weather Summary

Light rain (total 7mm), mostly falling on Fri morning. Cool air temperatures (max 12°C on Sat afternoon, min 2°C on Sat morning). Winds decreasing (fresh winds from the NW on Fri afternoon, calm by Sun night).

Days 4–6 Weather Summary

A light covering of new snow, mostly falling on Tue night will be washed away by heavy rain (total 30mm) on Wed night. Cool air temperatures (max 10°C on Mon afternoon, min 1°C on Tue night). Winds increasing (calm on Tue morning, fresh winds from the NE by Wed night).

Days 7–9 Weather Summary

Light rain (total 4mm), mostly falling on Thu afternoon. Mild temperatures (max 8°C on Fri afternoon, min 1°C on Thu morning). Winds decreasing (fresh winds from the NW on Thu morning, calm by Sat night).

Days 10–12 Weather Summary

Light rain (total 5mm), mostly falling on Tue night. Warm (max 23°C on Mon afternoon, min 1°C on Wed morning). Wind will be generally light.

Friday
29
Saturday
30
Sunday
31
Monday
1
Tuesday
2
Wednesday
3
Thursday
4
Friday
5
Saturday
6
Sunday
7
Monday
8
Tuesday
9
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
2:55PM2.69m
3:02AM2.94m
3:38PM2.60m
3:45AM2.90m
4:27PM2.51m
4:35AM2.87m
5:23PM2.45m
5:33AM2.86m
6:24PM2.46m
6:37AM2.89m
7:27PM2.55m
7:42AM2.98m
8:29PM2.72m
8:45AM3.11m
9:26PM2.95m
9:45AM3.25m
10:18PM3.19m
10:41AM3.36m
11:08PM3.41m
11:34AM3.42m
11:56PM3.56m
12:26PM3.41m
00:43AM3.63m
Low Tide
8:47AM0.11m
8:57PM0.37m
9:29AM0.16m
9:39PM0.46m
10:17AM0.23m
10:28PM0.53m
11:11AM0.27m
11:23PM0.58m
12:11PM0.28m
00:26AM0.56m
1:14PM0.22m
1:31AM0.45m
2:15PM0.10m
2:34AM0.27m
3:13PM-0.05m
3:34AM0.04m
4:06PM-0.20m
4:30AM-0.20m
4:57PM-0.31m
5:23AM-0.41m
5:45PM-0.37m
6:14AM-0.54m
6:33PM-0.35m
Wave
height (m) 
direction
period (s) 
mod rain
light rain
part cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
light rain
mod snow
light rain
mod rain
heavy rain
cloud
light rain
cloud
light rain
cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
thunderstorm
mod rain
light rain
some clouds
clear
clear
some clouds
some clouds
some clouds
some clouds
clear
clear
some clouds
some clouds
light rain
mod snow
light rain
mod rain
heavy rain
cloudy
light rain
cloudy
light rain
cloudy
some clouds
some clouds
some clouds
clear
clear
clear
clear
clear
clear
clear
clear
rain shwrs
risk tstorm
 km/h
20
NW
30
NW
25
WNW
25
WNW
20
WNW
10
WNW
15
WNW
15
NW
5
NNW
5
NNE
10
ESE
5
SSW
10
ESE
15
ESE
20
E
30
E
25
ENE
25
N
30
NW
20
NNW
25
NW
25
NNW
30
N
20
N
20
NNE
15
NE
5
WSW
10
WSW
10
WNW
5
WNW
10
WSW
15
W
10
SW
20
SW
20
WSW
15
NW
 mm 
6
1.0
2.0
4
7
17
3
1.0
1.0
4
max°C
4
7
6
6
12
9
9
12
10
8
10
8
8
7
2
4
4
4
1
3
3
7
8
6
4
6
5
9
18
17
16
23
20
21
23
17
Moonrise
11:58
1:05
2:08
3:03
3:48
4:25
4:55
5:21
5:45
6:08
6:33
Moonset
8:16
8:50
9:33
10:28
11:35
12:49
2:09
3:29
4:49
6:09
7:29
8:50
Sunrise
6:30
6:28
6:26
6:24
6:22
6:22
6:20
6:18
6:16
6:15
6:13
6:11
Sunset
7:07
7:07
7:08
7:09
7:10
7:12
7:13
7:14
7:15
7:16
7:17
7:19
Today's sea temperature in Castle Island, Boston Harbor is 5.2 °C (Statistics for 29 Mar 1981-2005 – mean: 4.2 max: 5.7 min: 2.6°C)
Nearest