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 08:23 PM.

Days 1–4 Weather Summary

Moderate rain (total 12mm), heaviest on Thu night. Very warm air temperatures (max 30°C on Thu afternoon, min 16°C on Tue afternoon). Wind will be generally light.

Days 5–7 Weather Summary

Light rain (total 4mm), mostly falling on Sat afternoon. Warm air temperatures (max 26°C on Mon morning, min 18°C on Fri night). Wind will be generally light.

Days 8–10 Weather Summary

Light rain (total 6mm), mostly falling on Wed afternoon. Warm (max 37°C on Tue afternoon, min 18°C on Thu morning). Wind will be generally light.

Days 11–13 Weather Summary

Some drizzle, heaviest during Fri night. Warm (max 34°C on Sat afternoon, min 15°C on Thu night). Wind will be generally light.

Tue
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Thursday
26
Friday
27
Saturday
28
Sun
29
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
4:48PM2.42m
5:02AM2.56m
5:42PM2.51m
6:02AM2.51m
6:38PM2.60m
7:04AM2.47m
7:35PM2.71m
8:09AM2.46m
8:32PM2.83m
9:12AM2.47m
9:28PM2.94m
10:10AM2.50m
10:22PM3.02m
11:05AM2.52m
11:15PM3.06m
12:00PM2.53m
00:08AM3.06m
12:53PM2.54m
1:00AM3.03m
1:43PM2.54m
1:51AM2.96m
2:31PM2.53m
2:40AM2.85m
Low Tide
10:51PM0.35m
11:23AM0.12m
11:51PM0.28m
12:16PM0.14m
00:51AM0.20m
1:11PM0.17m
1:54AM0.09m
2:08PM0.19m
2:57AM-0.02m
3:06PM0.18m
3:56AM-0.13m
4:02PM0.16m
4:51AM-0.22m
4:55PM0.14m
5:44AM-0.26m
5:47PM0.14m
6:36AM-0.26m
6:40PM0.14m
7:26AM-0.22m
7:32PM0.16m
8:14AM-0.15m
8:22PM0.21m
9:02AM-0.06m
Wave
height (m) 
direction
period (s) 
0.5
ESE
6.0
0.7
ESE
6.0
0.7
SE
7.0
0.6
SE
7.0
0.6
ESE
7.0
0.5
ESE
7.0
0.7
ESE
8.0
0.7
ESE
7.0
0.7
ESE
8.0
0.7
ESE
8.0
0.4
ESE
8.0
0.4
ESE
8.0
0.5
ESE
8.0
0.4
ESE
8.0
0.3
ESE
9.0
0.4
ESE
8.0
0.4
ESE
8.0
0.3
ESE
8.0
0.7
SSE
4.0
0.7
SSE
5.0
0.4
ESE
8.0
0.4
ESE
8.0
0.5
SE
6.0
0.3
ESE
8.0
0.4
ESE
8.0
0.4
ESE
8.0
0.5
NE
4.0
0.4
ENE
4.0
0.4
ENE
4.0
0.4
SE
8.0
0.4
ESE
8.0
0.6
SE
4.0
0.6
SE
4.0
0.6
SE
5.0
0.5
SE
6.0
0.4
SE
9.0
cloud
mod rain
light rain
cloud
part cloud
part cloud
part cloud
rain showers
part cloud
part cloud
clear
clear
light rain
thunderstorm
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
cloud
part cloud
clear
cloud
part cloud
light rain
cloud
clear
part cloud
part cloud
cloudy
mod rain
light rain
cloudy
some clouds
some clouds
some clouds
rain shwrs
some clouds
some clouds
clear
clear
light rain
risk tstorm
some clouds
some clouds
some clouds
clear
clear
clear
clear
clear
clear
clear
risk tstorm
risk tstorm
cloudy
some clouds
clear
cloudy
some clouds
light rain
cloudy
clear
some clouds
some clouds
 km/h
10
SE
15
S
10
S
10
SSW
5
SW
10
SSW
15
S
10
SSW
20
WSW
25
NW
10
W
5
SSE
10
SW
10
W
10
E
10
SE
5
SSW
10
SSE
20
SSE
15
WSW
15
WNW
10
W
5
NNW
5
SW
10
S
10
NNW
10
ENE
10
SE
5
E
10
SE
15
SSE
10
SSW
20
SW
15
W
10
W
5
WNW
 mm 
6
3
3
3
1
2
4
1
max°C
16
17
19
21
21
27
30
27
26
23
20
23
24
24
24
23
19
26
27
27
33
37
34
33
33
27
19
18
17
15
17
18
26
34
31
29
Moonrise
12:13
12:34
12:55
1:17
1:41
2:11
2:49
3:39
4:41
5:54
7:10
8:26
9:37
Moonset
11:22
12:34
1:48
3:05
4:25
5:47
7:08
8:20
9:18
10:04
10:38
11:04
11:26
Sunrise
5:03
5:03
5:03
5:03
5:03
5:03
5:03
5:03
5:03
5:05
5:05
5:05
Sunset
8:23
8:24
8:24
8:24
8:24
8:25
8:25
8:25
8:25
8:25
8:25
8:25
Today's sea temperature in Seavey Island, Portsmouth Harbor is 14.7 °C (Statistics for 17 Jun 1981-2005 – mean: 14.3 max: 16.2 min: 12.2°C)
Issued (local time): 1 pm Tuesday 17 Jun 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest