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 05:11 AM and sunset is at 08:22 PM.

Days 1–3 Weather Summary

Light rain (total 4mm), mostly falling on Thu morning. Warm air temperatures (max 22°C on Fri morning, min 16°C on Thu night). Wind will be generally light.

Days 4–6 Weather Summary

Light rain (total 2mm), mostly falling on Mon afternoon. Very warm air temperatures (max 31°C on Tue afternoon, min 18°C on Sun morning). Wind will be generally light.

Days 7–9 Weather Summary

Light rain (total 8mm), mostly falling on Thu night. Warm (max 36°C on Thu afternoon, min 17°C on Fri afternoon). Wind will be generally light.

Days 10–12 Weather Summary

Light rain (total 2mm), mostly falling on Sun morning. Warm (max 27°C on Sun morning, min 18°C on Sat morning). Wind will be generally light.

Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
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
12:10PM2.23m
00:07AM2.68m
12:49PM2.29m
00:47AM2.73m
1:28PM2.35m
1:27AM2.76m
2:07PM2.43m
2:10AM2.77m
2:48PM2.50m
2:56AM2.75m
3:32PM2.58m
3:44AM2.69m
4:19PM2.65m
4:37AM2.61m
5:09PM2.71m
5:34AM2.51m
6:03PM2.75m
6:36AM2.42m
7:01PM2.79m
7:43AM2.36m
8:03PM2.82m
8:50AM2.34m
9:06PM2.86m
Low Tide
5:56AM0.12m
5:50PM0.41m
6:34AM0.06m
6:31PM0.35m
7:12AM0.00m
7:12PM0.29m
7:51AM-0.04m
7:56PM0.23m
8:31AM-0.07m
8:42PM0.18m
9:14AM-0.08m
9:32PM0.14m
9:59AM-0.05m
10:25PM0.11m
10:47AM-0.00m
11:23PM0.09m
11:40AM0.07m
00:24AM0.07m
12:37PM0.14m
1:29AM0.04m
1:38PM0.19m
2:36AM-0.01m
2:42PM0.21m
3:39AM-0.08m
Wave
height (m) 
direction
period (s) 
0.4
SE
12.0
0.4
ESE
12.0
0.4
SE
11.0
0.3
ESE
11.0
0.6
SE
3.0
0.4
ESE
4.0
0.4
SE
10.0
0.6
SE
3.0
0.6
ESE
4.0
0.4
ESE
4.0
0.6
SE
4.0
0.6
SE
5.0
0.4
ESE
4.0
0.5
SE
3.0
0.4
ESE
4.0
0.4
SE
8.0
0.5
SE
8.0
0.4
SE
7.0
0.3
SE
6.0
0.4
SE
3.0
0.7
SSE
6.0
0.6
SSE
5.0
0.8
SSE
5.0
0.5
SSE
6.0
0.3
ESE
16.0
0.8
ENE
4.0
0.7
ENE
4.0
0.5
ENE
4.0
0.4
ENE
4.0
0.4
SE
8.0
0.4
SE
6.0
0.6
SE
3.0
0.4
SE
5.0
0.4
SE
6.0
0.4
SE
6.0
0.4
SE
4.0
light rain
cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
thunderstorm
rain showers
clear
clear
clear
clear
clear
clear
clear
part cloud
rain showers
cloud
light rain
cloud
cloud
part cloud
clear
rain showers
thunderstorm
clear
clear
part cloud
clear
light rain
cloudy
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
some clouds
clear
some clouds
risk tstorm
rain shwrs
clear
clear
clear
clear
clear
clear
clear
some clouds
rain shwrs
cloudy
light rain
cloudy
cloudy
some clouds
clear
rain shwrs
risk tstorm
clear
clear
some clouds
clear
 km/h
10
E
10
ESE
0
ENE
10
SSE
20
SSE
5
SSE
15
SE
15
SE
10
SSE
15
SE
20
SE
10
S
15
SSE
15
SSE
5
NNW
0
WNW
10
SSE
5
W
5
SSE
15
SE
15
SW
20
SW
15
SW
10
SW
15
NE
20
NE
15
NNE
10
NE
10
SE
5
SSW
10
SSW
15
SSE
10
WSW
10
E
15
ESE
10
SSW
 mm 
4
1
1
6
2
1
1
max°C
18
18
17
22
22
19
22
21
18
21
21
21
25
25
22
29
31
28
28
31
28
32
36
23
23
19
17
20
22
20
27
26
26
26
27
25
Moonrise
8:50
9:25
9:54
10:18
10:40
11:00
11:21
11:44
12:11
12:45
1:28
Moonset
4:27
5:34
6:47
8:00
9:13
10:26
11:39
12:53
2:11
3:30
4:49
6:03
Sunrise
5:11
5:13
5:13
5:15
5:15
5:16
5:16
5:18
5:18
5:20
5:20
5:22
Sunset
8:22
8:22
8:22
8:21
8:21
8:20
8:19
8:19
8:17
8:16
8:15
8:15
Today's sea temperature in Seavey Island, Portsmouth Harbor (sub) is 18.2 °C (Statistics for 10 Jul 1981-2005 – mean: 17.6 max: 19.2 min: 16.0°C)
Issued (local time): 1 am Thursday 10 Jul 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest