Gerrish Island, Portsmouth Harbor Sea Conditions and Tide Table

Gerrish 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 08:25 PM.

Days 1–4 Weather Summary

Light rain (total 6mm), mostly falling on Wed afternoon. Very warm air temperatures (max 36°C on Tue afternoon, min 15°C on Fri morning). Wind will be generally light.

Days 5–7 Weather Summary

Heavy rain (total 37mm), heaviest during Sat afternoon. Warm air temperatures (max 21°C on Mon morning, min 12°C on Sat morning). Wind will be generally light.

Days 8–10 Weather Summary

Light rain (total 2mm), mostly falling on Mon night. Warm (max 32°C on Tue afternoon, min 20°C on Wed night). Wind will be generally light.

Days 11–13 Weather Summary

Light rain (total 5mm), mostly falling on Fri night. Warm (max 29°C on Thu afternoon, min 18°C on Sat night). Wind will be generally light.

Tue
24
Wednesday
25
Thursday
26
Friday
27
Saturday
28
Sunday
29
Monday
30
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sun
6
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
10:51PM3.28m
11:39AM2.73m
11:46PM3.28m
12:33PM2.74m
00:39AM3.23m
1:26PM2.73m
1:31AM3.14m
2:17PM2.71m
2:23AM3.02m
3:08PM2.67m
3:15AM2.87m
3:57PM2.63m
4:07AM2.71m
4:46PM2.59m
5:00AM2.56m
5:36PM2.56m
5:55AM2.42m
6:26PM2.55m
6:52AM2.32m
7:15PM2.55m
7:49AM2.26m
8:05PM2.58m
8:44AM2.23m
Low Tide
4:32PM0.08m
5:23AM-0.32m
5:27PM0.07m
6:17AM-0.33m
6:22PM0.09m
7:08AM-0.29m
7:15PM0.12m
7:59AM-0.21m
8:09PM0.18m
8:49AM-0.10m
9:02PM0.26m
9:38AM0.02m
9:56PM0.33m
10:26AM0.16m
10:51PM0.39m
11:14AM0.29m
11:47PM0.43m
12:03PM0.40m
00:44AM0.45m
12:53PM0.49m
1:41AM0.44m
1:43PM0.55m
2:35AM0.40m
Wave
height (m) 
direction
period (s) 
0.4
ESE
8.0
0.4
ESE
8.0
0.3
ESE
8.0
0.3
ESE
8.0
0.5
NE
3.0
0.7
E
4.0
0.5
E
4.0
0.4
E
4.0
0.4
SE
10.0
0.4
SE
10.0
1
E
4.0
1.9
ESE
7.0
1.9
ESE
8.0
1.7
ESE
8.0
1.3
ESE
8.0
1.3
ESE
8.0
1.1
ESE
8.0
1.1
ESE
9.0
1.3
ESE
9.0
1.1
ESE
9.0
0.9
ESE
9.0
0.9
ESE
9.0
0.9
ESE
9.0
0.7
ESE
9.0
0.7
ESE
9.0
0.6
ESE
9.0
0.6
ESE
9.0
0.5
E
8.0
0.5
E
8.0
0.4
ESE
8.0
0.4
ESE
8.0
0.4
ESE
9.0
0.3
ESE
8.0
0.4
ESE
16.0
0.5
ESE
16.0
0.7
ESE
15.0
clear
thunderstorm
rain showers
rain showers
cloud
cloud
cloud
cloud
light rain
cloud
mod rain
heavy rain
heavy rain
light rain
part cloud
part cloud
part cloud
part cloud
part cloud
rain showers
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
rain showers
clear
part cloud
part cloud
part cloud
clear
risk tstorm
rain shwrs
rain shwrs
cloudy
cloudy
cloudy
cloudy
light rain
cloudy
mod rain
heavy rain
heavy rain
light rain
some clouds
some clouds
some clouds
some clouds
some clouds
rain shwrs
some clouds
some clouds
clear
clear
clear
clear
clear
clear
some clouds
some clouds
some clouds
rain shwrs
clear
some clouds
some clouds
some clouds
 km/h
10
WSW
15
W
5
ENE
10
SSE
20
NE
15
ENE
5
SE
0
SSE
5
E
10
ESE
30
E
25
E
20
E
15
NNE
10
NNE
15
ENE
5
NNW
10
SSE
25
SSE
15
SW
20
SW
20
WSW
10
WNW
10
W
15
W
15
W
20
W
15
W
10
NW
5
E
10
SSE
10
NW
5
ESE
15
SSE
15
SSW
20
S
 mm 
1
1
3
1
6
16
14
1
2
4
max°C
36
30
28
28
25
17
17
17
16
16
15
13
13
14
14
17
15
21
23
24
28
32
28
28
31
27
26
29
26
23
23
20
23
24
23
25
Moonrise
3:39
4:41
5:54
7:10
8:26
9:37
10:45
11:50
12:53
1:56
2:59
4:04
5:09
Moonset
8:19
9:18
10:03
10:37
11:04
11:25
11:44
12:02
12:20
12:38
1:00
1:25
Sunrise
5:03
5:03
5:05
5:05
5:05
5:05
5:05
5:07
5:07
5:07
5:09
5:09
Sunset
8:25
8:25
8:25
8:25
8:25
8:25
8:25
8:24
8:24
8:24
8:24
8:24
Today's sea temperature in Gerrish Island, Portsmouth Harbor is 14.8 °C (Statistics for 24 Jun 1981-2005 – mean: 15.3 max: 18.4 min: 13.4°C)
Issued (local time): 1 pm Tuesday 24 Jun 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest