Seavey Island, Portsmouth Harbor Sea Conditions and Tide Table

Seavey Island, Portsmouth 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 — and sunset is at 04:13 PM.

Days 1–4 Weather Summary

Mostly dry. Icy conditions (max 1°C on Sun morning, min -13°C on Thu night). Winds decreasing (fresh winds from the NW on Thu afternoon, calm by Fri afternoon).

Days 5–7 Weather Summary

A dusting of snow turning to light rain (total 6mm) on Sun night. Icy conditions (max 4°C on Mon afternoon, min -8°C on Tue night). Winds increasing (calm on Sun night, fresh winds from the WSW by Mon night).

Days 8–10 Weather Summary

Mostly dry. Temperatures will be below freezing (max 0°C on Fri morning, min -11°C on Wed night). Wind will be generally light.

Days 11–13 Weather Summary

A dusting of new snow. Freeze-thaw conditions (max 4°C on Tue afternoon, min -8°C on Sat night). Wind will be generally light.

Thu
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thursday
1
Friday
2
Saturday
3
Sunday
4
Monday
5
Tue
6
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
2:38PM2.52m
3:19AM2.33m
3:31PM2.45m
4:11AM2.39m
4:30PM2.39m
5:06AM2.47m
5:31PM2.34m
6:02AM2.57m
6:35PM2.32m
7:00AM2.68m
7:41PM2.33m
7:58AM2.80m
8:41PM2.36m
8:54AM2.90m
9:38PM2.42m
9:48AM2.99m
10:33PM2.48m
10:42AM3.04m
11:26PM2.53m
11:35AM3.05m
00:17AM2.57m
12:27PM3.01m
1:06AM2.59m
Low Tide
9:04PM0.08m
9:22AM0.33m
9:53PM0.11m
10:20AM0.28m
10:45PM0.15m
11:19AM0.21m
11:39PM0.18m
12:21PM0.12m
00:35AM0.20m
1:25PM0.01m
1:35AM0.18m
2:27PM-0.12m
2:33AM0.16m
3:24PM-0.23m
3:28AM0.10m
4:18PM-0.32m
4:22AM0.04m
5:10PM-0.37m
5:15AM-0.00m
6:01PM-0.37m
6:07AM-0.02m
6:49PM-0.33m
6:58AM-0.00m
Wave
height (m) 
direction
period (s) 
1
E
9
0.9
ESE
11
0.7
E
11
0.6
E
10
0.5
E
10
0.7
E
12
0.6
E
11
0.5
E
11
0.4
ESE
12
0.3
ESE
12
0.3
ESE
11
0.5
SSE
4
0.5
SE
5
1.2
SW
4
1.1
W
4
1
W
4
0.8
W
4
0.9
SW
4
0.8
SW
4
0.6
W
3
0.5
W
3
0.6
W
3
0.7
WSW
3
0.5
SW
3
0.4
SW
3
0.5
WSW
3
0.5
NW
3
0.2
ESE
10
0.3
ESE
10
0.1
SE
9
0.1
SE
9
0.4
SSW
3
0.7
SSW
4
0.5
S
5
0.4
WSW
2
0.2
ESE
9
clear
clear
part cloud
part cloud
cloud
part cloud
clear
clear
clear
cloud
light snow
light rain
light rain
part cloud
part cloud
part cloud
clear
cloud
part cloud
clear
clear
clear
cloud
cloud
clear
clear
clear
clear
clear
clear
part cloud
cloud
cloud
part cloud
snow showers
part cloud
clear
clear
some clouds
some clouds
cloudy
some clouds
clear
clear
clear
cloudy
light snow
light rain
light rain
some clouds
some clouds
some clouds
clear
cloudy
some clouds
clear
clear
clear
cloudy
cloudy
clear
clear
clear
clear
clear
clear
some clouds
cloudy
cloudy
some clouds
snow shwrs
some clouds
 km/h
30
NW
20
NW
10
NW
5
NNW
10
NNE
10
N
5
NW
10
WNW
10
NW
10
WSW
10
SW
5
N
5
SW
40
WSW
35
W
30
W
25
W
25
SW
20
WSW
20
WNW
20
W
20
W
20
WSW
20
SW
10
WSW
20
WNW
15
NW
10
W
10
WNW
5
NW
5
SW
15
SSW
20
SW
10
SW
15
W
10
WNW
 mm 
2
3
1
max°C
-2
-9
-7
-7
-7
-5
-3
-5
1
1
2
2
4
3
-5
-6
-6
0
-1
-6
-7
-6
-5
0
0
-2
-6
-6
-8
-4
-3
-2
3
3
2
3
Moonrise
10:58
11:18
11:39
12:04
12:35
1:15
2:08
3:15
4:32
5:52
7:11
Moonset
10:00
11:10
12:21
1:37
2:56
4:18
5:38
6:49
7:47
8:31
9:05
9:31
Sunrise
7:13
7:13
7:13
7:13
7:13
7:13
7:13
7:13
7:13
7:13
7:13
7:13
Sunset
4:13
4:13
4:14
4:15
4:15
4:15
4:16
4:17
4:19
4:20
4:21
4:22
Today's sea temperature in Seavey Island, Portsmouth Harbor is
6.5° C
(Statistics for 25 Dec 1981-2005 – mean: 6.2 max: 7.5 min: 4.2°C)
Issued (local time): 6 pm Thursday 25 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
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