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 04:12 PM.

Days 1–3 Weather Summary

A dusting of new snow. Icy conditions (max 1°C on Thu morning, min -3°C on Mon night). Wind will be generally light.

Days 4–6 Weather Summary

A light covering of new snow, mostly falling on Sun morning. Icy conditions (max 1°C on Sun afternoon, min -12°C on Thu night). Wind will be generally light.

Days 7–9 Weather Summary

Mostly dry. Temperatures will be below freezing (max 0°C on Sun night, min -10°C on Tue night). Winds decreasing (fresh winds from the W on Sun night, light winds from the W by Wed afternoon).

Days 10–12 Weather Summary

A moderate fall of snow, heaviest on Thu night. Temperatures will be below freezing (max 0°C on Thu morning, min -15°C on Thu night). Winds increasing (calm on Wed night, fresh winds from the WNW by Fri afternoon).

Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thursday
1
Friday
2
Sat
3
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
Wave Height Map
High Tide
1:10PM2.59m
1:48AM2.26m
1:51PM2.57m
2:31AM2.29m
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
Low Tide
7:35PM0.05m
7:40AM0.36m
8:17PM0.06m
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
Wave
height (m) 
direction
period (s) 
0.2
ESE
10
0.2
ESE
10
0.3
ESE
10
0.9
N
4
1.6
E
8
1.4
ESE
8
1.1
ESE
9
1
E
9
1
E
10
0.7
E
10
0.6
E
10
0.6
NE
3
0.8
E
12
0.7
E
11
0.6
E
12
0.5
E
12
0.9
SSE
4
0.6
SE
5
0.7
W
4
0.7
WSW
4
0.8
W
4
0.7
WNW
4
0.6
WNW
3
0.7
WNW
3
0.4
WNW
3
0.2
ESE
10
0.2
E
10
0.4
ESE
10
0.5
SSE
4
1
WSW
4
0.8
W
4
1
W
4
1.2
WNW
4
0.9
WNW
4
0.8
WNW
4
cloud
light snow
light snow
part cloud
part cloud
cloud
cloud
clear
clear
part cloud
cloud
light snow
clear
clear
part cloud
light snow
light snow
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
cloud
light snow
part cloud
snow showers
light snow
cloud
cloud
part cloud
clear
cloudy
light snow
light snow
some clouds
some clouds
cloudy
cloudy
clear
clear
some clouds
cloudy
light snow
clear
clear
some clouds
light snow
light snow
some clouds
some clouds
clear
some clouds
clear
clear
clear
clear
some clouds
cloudy
light snow
some clouds
snow shwrs
light snow
cloudy
cloudy
some clouds
clear
 km/h
5
ENE
5
ESE
10
NW
25
NNW
15
NE
10
WSW
15
WSW
20
NW
20
NW
15
NW
5
N
15
NNE
15
NNE
5
NNE
5
NNW
10
SW
15
S
20
W
25
W
25
WSW
25
W
25
WNW
20
WNW
20
WNW
15
WNW
10
W
5
SSW
10
S
15
SW
35
WSW
25
WNW
40
WNW
35
WNW
25
WNW
25
WNW
 mm 
max°C
0
0
0
0
-1
-2
1
1
-6
-8
-7
-8
-6
-5
-6
-2
1
0
-4
-5
-6
-2
-4
-7
-5
-5
-3
0
0
-5
-5
-4
-8
-9
-9
Moonrise
9:52
10:16
10:38
10:58
11:18
11:39
12:04
12:35
1:15
2:08
3:15
4:32
Moonset
7:42
8:51
10:00
11:10
12:21
1:37
2:56
4:18
5:38
6:49
7:47
Sunrise
7:11
7:11
7:11
7:13
7:13
7:13
7:13
7:13
7:13
7:13
7:13
7:13
Sunset
4:12
4:12
4:13
4:13
4:14
4:15
4:15
4:15
4:16
4:17
4:19
4:20
Today's sea temperature in Seavey Island, Portsmouth Harbor is
6.7° C
(Statistics for 23 Dec 1981-2005 – mean: 6.3 max: 7.7 min: 5.0°C)
Issued (local time): 12 am Tuesday 23 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest