Seavey Island, Portsmouth Harbor (sub) Sea Conditions and Tide Table

Seavey Island, Portsmouth Harbor (sub) 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 06:45 PM.

Days 1–4 Weather Summary

Light rain (total 9mm), mostly falling on Mon morning. Icy conditions (max 6°C on Mon morning, min -3°C on Sat night). Winds decreasing (fresh winds from the WNW on Sat night, light winds from the E by Sun morning).

Days 5–7 Weather Summary

Moderate rain (total 15mm), heaviest on Mon night. Icy conditions (max 15°C on Mon night, min -6°C on Tue night). Winds decreasing (strong winds from the S on Mon night, calm by Wed night).

Days 8–10 Weather Summary

Some drizzle, heaviest during Fri night. Freeze-thaw conditions (max 9°C on Fri afternoon, min -5°C on Sat morning). Winds increasing (calm on Fri afternoon, fresh winds from the NW by Sat afternoon).

Days 11–13 Weather Summary

Mostly dry. Freeze-thaw conditions (max 8°C on Sun afternoon, min -7°C on Mon night). Winds decreasing (fresh winds from the NW on Mon afternoon, calm by Wed morning).

Fri
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Thursday
26
Friday
27
Saturday
28
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
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
Wave Height Map
High Tide
8:26PM1.98m
8:33AM2.29m
9:19PM2.08m
9:27AM2.39m
10:05PM2.22m
10:14AM2.51m
10:46PM2.37m
10:57AM2.62m
11:24PM2.53m
11:39AM2.71m
00:02AM2.68m
12:21PM2.76m
00:40AM2.81m
1:04PM2.77m
1:20AM2.90m
1:49PM2.72m
2:04AM2.93m
2:38PM2.64m
2:51AM2.91m
3:31PM2.52m
3:44AM2.83m
4:30PM2.39m
4:43AM2.73m
5:36PM2.29m
5:50AM2.63m
6:48PM2.24m
7:04AM2.57m
Low Tide
2:09PM0.41m
2:14AM0.58m
3:03PM0.33m
3:09AM0.47m
3:50PM0.23m
3:58AM0.33m
4:32PM0.11m
4:42AM0.17m
5:10PM-0.01m
5:24AM0.01m
5:48PM-0.09m
6:07AM-0.13m
6:26PM-0.15m
6:49AM-0.24m
7:06PM-0.16m
7:35AM-0.30m
7:49PM-0.13m
8:23AM-0.30m
8:36PM-0.05m
9:14AM-0.24m
9:26PM0.06m
10:11AM-0.14m
10:23PM0.19m
11:15AM-0.02m
11:28PM0.30m
12:26PM0.06m
00:41AM0.35m
1:38PM0.09m
Wave
height (m) 
direction
period (s) 
0.5
SE
9
1.7
SSE
6
0.9
SE
8
0.9
WSW
4
0.7
W
4
0.1
SE
10
0.4
SSE
3
0.9
SE
4
2
SE
7
1.8
SE
8
3
SE
9
1.7
SE
10
1.5
SE
10
1.3
SE
11
0.9
SE
10
0.8
SE
10
0.6
SE
10
0.6
SE
9
0.8
SE
9
0.9
SE
8
0.6
SE
8
0.6
ESE
8
0.6
SE
8
0.8
NNW
3
0.8
NW
4
0.9
ESE
10
0.5
ESE
10
0.4
ESE
10
0.4
ESE
9
0.6
WNW
3
1.2
NNW
4
1
NW
4
0.7
NW
4
0.9
NW
4
0.4
NNE
5
0.6
NE
6
0.5
NE
7
0.9
ESE
4
2.5
E
7
3
ESE
10
2
ESE
10
1.1
ESE
9
0.9
ESE
9
0.6
ESE
9
0.5
ESE
9
0.6
ESE
9
0.6
ESE
9
cloud
rain showers
part cloud
part cloud
clear
part cloud
cloud
part cloud
mod rain
light rain
heavy rain
rain showers
part cloud
clear
part cloud
clear
part cloud
part cloud
cloud
part cloud
part cloud
cloud
rain showers
clear
part cloud
part cloud
cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
cloud
mod snow
heavy snow
mod rain
cloud
clear
part cloud
clear
cloud
part cloud
light snow
cloudy
rain shwrs
some clouds
some clouds
clear
some clouds
cloudy
some clouds
mod rain
light rain
heavy rain
rain shwrs
some clouds
clear
some clouds
clear
some clouds
some clouds
cloudy
some clouds
some clouds
cloudy
rain shwrs
clear
some clouds
some clouds
cloudy
cloudy
some clouds
some clouds
clear
clear
clear
clear
clear
some clouds
cloudy
mod snow
heavy snow
mod rain
cloudy
clear
some clouds
clear
cloudy
some clouds
light snow
 km/h
15
SW
25
S
25
WSW
30
W
25
WNW
10
E
20
SSE
15
SE
20
SE
20
S
45
S
25
W
25
W
30
W
25
W
15
W
0
N
15
SSE
15
S
15
SSW
10
SW
5
SSE
25
NW
25
NW
25
WNW
20
W
10
W
10
WNW
15
W
30
NW
35
NW
30
NW
25
NW
25
NW
15
NW
5
NE
15
SE
25
ESE
40
E
10
SSE
25
NW
20
WNW
20
WNW
10
W
5
ENE
15
ENE
15
ENE
 mm 
3
6
3
11
1
1
8
max°C
4
4
5
5
2
0
1
3
6
11
15
6
4
0
-2
3
2
2
4
4
5
9
3
-1
2
-1
3
8
3
4
5
-1
-2
2
-3
-1
1
0
1
3
1
1
3
0
0
2
1
Moonrise
4:53
5:23
5:49
6:11
6:32
6:53
7:15
7:40
8:11
8:50
9:40
10:42
11:53
1:09
2:24
Moonset
1:57
3:07
4:18
5:30
6:43
7:57
9:15
10:35
11:55
1:12
2:20
3:16
3:59
4:33
Sunrise
6:56
6:54
6:54
6:52
6:50
6:48
6:47
6:45
6:43
6:41
6:39
6:37
6:35
6:33
6:31
Sunset
6:45
6:46
6:47
6:49
6:51
6:52
6:52
6:53
6:54
6:57
6:58
6:59
7:00
7:00
7:01
7:04
Today's sea temperature in Seavey Island, Portsmouth Harbor (sub) is
3.3° C
(Statistics for 13 Mar 1981-2005 – mean: 3.1 max: 4.2 min: 1.4°C)
Issued (local time): 1 pm Friday 13 Mar 2026
Forecast update inUpdates in  hr  min  sUpdate imminent
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