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 07:07 PM.

Days 1–4 Weather Summary

A light covering of new snow, mostly falling on Thu morning. Becoming milder with light rain (total 9mm) on Thu afternoon. Icy conditions (max 15°C on Thu night, min -3°C on Wed morning). Wind will be generally light.

Days 5–7 Weather Summary

A dusting of snow giving way to moderate rain (total 12mm) heaviest on Mon morning. Cool air temperatures (max 15°C on Sun night, min 1°C on Sat night). Wind will be generally light.

Days 8–10 Weather Summary

Some drizzle, heaviest during Tue night. Freeze-thaw conditions (max 10°C on Mon night, min -2°C on Wed morning). Wind will be generally light.

Days 11–13 Weather Summary

A dusting of snow giving way to moderate rain (total 18mm) heaviest on Sat afternoon. Mild temperatures (max 9°C on Sun night, min 2°C on Fri night). Winds decreasing (fresh winds from the ENE on Fri night, calm by Sat night).

Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sun
13
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
Wave Height Map
High Tide
2:42AM9.97ft
3:25PM8.56ft
3:37AM9.51ft
4:25PM8.04ft
4:37AM9.02ft
5:31PM7.61ft
5:44AM8.53ft
6:42PM7.38ft
6:56AM8.2ft
7:51PM7.35ft
8:07AM8.07ft
8:54PM7.55ft
9:10AM8.1ft
9:48PM7.78ft
10:05AM8.2ft
10:34PM8.07ft
10:52AM8.24ft
11:14PM8.27ft
11:34AM8.24ft
11:49PM8.43ft
12:12PM8.17ft
00:22AM8.53ft
12:47PM8.04ft
Low Tide
8:26PM-0.43ft
9:07AM-1.15ft
9:19PM0.1ft
10:05AM-0.66ft
10:18PM0.62ft
11:09AM-0.13ft
11:23PM1.08ft
12:18PM0.3ft
00:35AM1.35ft
1:28PM0.52ft
1:47AM1.38ft
2:33PM0.59ft
2:52AM1.18ft
3:29PM0.52ft
3:49AM0.89ft
4:18PM0.49ft
4:38AM0.62ft
5:00PM0.46ft
5:20AM0.39ft
5:37PM0.52ft
5:59AM0.23ft
6:10PM0.62ft
6:35AM0.16ft
Wave
height (ft) 
direction
period (s) 
2.5
SE
10
2
SE
9
2
SE
9
3.5
SSE
4
4.5
SE
6
4.5
SE
8
2.5
SE
8
1.5
SE
8
1.5
SE
8
1.5
SE
7
1.5
SE
12
2
ESE
4
3.5
SE
6
3.5
SE
7
3.5
SE
7
2.5
SE
7
2
SE
8
2
SE
9
1.5
SE
9
2.5
SE
4
2.5
WNW
3
2
W
3
2.5
W
3
2
WNW
3
1
SE
8
0.5
SE
8
0.5
SSE
8
1
SE
7
1.5
SE
4
4
ESE
5
10
ESE
9
7.5
ESE
10
6
ESE
10
4.5
ESE
10
4
ESE
9
3.5
SE
9
clear
part cloud
part cloud
light snow
light snow
mod rain
light rain
part cloud
part cloud
clear
part cloud
cloud
light snow
light rain
light rain
light rain
light rain
rain showers
clear
part cloud
cloud
rain showers
clear
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
light rain
light snow
heavy rain
light rain
cloud
part cloud
clear
some clouds
some clouds
light snow
light snow
mod rain
light rain
some clouds
some clouds
clear
some clouds
cloudy
light snow
light rain
light rain
light rain
light rain
rain shwrs
clear
some clouds
cloudy
rain shwrs
clear
some clouds
some clouds
some clouds
some clouds
some clouds
cloudy
some clouds
light rain
light snow
heavy rain
light rain
cloudy
some clouds
 mph
15
NW
5
NW
5
ESE
10
SSE
20
SSE
5
SSE
10
SW
10
W
10
WNW
5
NW
5
ESE
10
ESE
10
SE
5
E
5
WSW
5
S
10
W
10
WNW
5
WNW
5
S
10
WSW
15
WNW
10
WNW
15
WNW
5
NNW
5
N
10
SE
10
SSE
10
E
15
E
20
ENE
20
ENE
20
NE
5
NNW
5
SSW
5
SW
 in 
0.3
0.04
0.08
0.08
0.04
0.04
0.2
0.04
0.04
0.1
0.08
0.4
0.08
max°F
46
28
30
34
34
41
59
52
45
50
41
36
36
39
43
59
55
46
50
37
46
46
30
34
41
34
39
43
39
41
37
36
39
43
45
46
Moonrise
7:53
8:35
9:28
10:31
11:40
12:51
2:01
3:08
4:13
5:16
6:18
7:20
8:23
Moonset
11:52
1:08
2:12
3:02
3:41
4:10
4:34
4:54
5:12
5:29
5:46
6:04
Sunrise
6:24
6:22
6:20
6:18
6:16
6:15
6:13
6:11
6:09
6:07
6:05
6:05
Sunset
7:07
7:08
7:10
7:12
7:13
7:14
7:15
7:15
7:17
7:19
7:20
7:21
7:22
Today's sea temperature in Seavey Island, Portsmouth Harbor (sub) is 40 °F (Statistics for 01 Apr 1981-2005 – mean: 39 max: 42 min: 37°F)
Issued (local time): 7 pm Tuesday 01 Apr 2025
Forecast update inUpdates in 3 hr 29 min 44 sUpdate imminent
Nearest