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 07:11 AM and sunset is at 04:13 PM.

Days 1–3 Weather Summary

Mostly dry. Icy conditions (max 3°C on Thu morning, min -13°C on Thu night). Wind will be generally light.

Days 4–6 Weather Summary

A dusting of snow turning to light rain (total 9mm) on Sun night. Icy conditions (max 5°C on Mon morning, min -6°C on Tue night). Winds increasing (calm on Sun night, fresh winds from the W by Mon night).

Days 7–9 Weather Summary

Mostly dry. Temperatures will be below freezing (max 0°C on Wed morning, min -16°C on Thu night). Wind will be generally light.

Days 10–12 Weather Summary

Light rain (total 3mm), mostly falling on Sat afternoon. Freeze-thaw conditions (max 6°C on Sat morning, min -10°C on Mon night). Wind will be generally light.

Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thursday
1
Friday
2
Saturday
3
Sunday
4
Monday
5
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
2:38PM2.52m
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
8:28AM0.35m
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
ESE
9
0.9
ESE
9
1
E
10
0.7
E
11
0.6
E
10
0.5
E
10
0.6
E
12
0.6
E
12
0.5
E
12
0.4
ESE
12
0.3
E
12
0.2
E
11
1.2
SSE
5
0.9
SE
6
0.9
WSW
4
0.9
W
4
0.9
W
4
0.7
W
4
0.5
WSW
3
0.5
SW
3
0.9
SSW
4
0.6
W
3
0.6
NW
3
0.5
NW
3
0.2
E
11
0.2
E
11
0.3
ESE
10
1.2
SSE
5
1.1
SE
7
0.6
SSE
7
0.4
SE
8
0.4
ESE
10
0.4
ESE
9
0.3
ESE
9
0.4
ESE
9
0.8
NE
6
part cloud
clear
clear
part cloud
cloud
cloud
cloud
clear
clear
clear
part cloud
light snow
light rain
light rain
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
clear
clear
part cloud
part cloud
cloud
cloud
light rain
clear
clear
cloud
cloud
cloud
part cloud
clear
some clouds
clear
clear
some clouds
cloudy
cloudy
cloudy
clear
clear
clear
some clouds
light snow
light rain
light rain
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
cloudy
some clouds
clear
clear
some clouds
some clouds
cloudy
cloudy
light rain
clear
clear
cloudy
cloudy
cloudy
some clouds
clear
 km/h
15
WSW
30
NW
20
NW
10
NW
5
NW
10
NNE
10
N
5
N
10
WNW
10
WNW
5
WNW
5
SSW
15
S
10
SW
35
W
30
W
30
W
25
W
20
WSW
20
SW
25
SW
25
NW
20
NW
20
WNW
10
WNW
5
WSW
10
SSW
20
SSW
20
WSW
15
WNW
10
NW
5
NNE
5
NW
5
WNW
15
NW
15
NNW
 mm 
4
4
1
3
max°C
3
-1
-8
-7
-7
-7
-5
-4
-5
1
1
2
5
5
1
-3
-4
-4
0
0
0
-4
-8
-12
-11
-8
-2
6
6
3
0
-1
0
1
0
-5
Moonrise
10:38
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
Sunrise
7:11
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 am Thursday 25 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
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