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 08:00 PM.

Days 1–4 Weather Summary

Mostly dry. Very warm air temperatures (max 33°C on Tue afternoon, min 13°C on Mon morning). Winds increasing (calm on Mon night, fresh winds from the WNW by Wed afternoon).

Days 5–7 Weather Summary

Mostly dry. Warm air temperatures (max 21°C on Wed night, min 10°C on Thu morning). Wind will be generally light.

Days 8–10 Weather Summary

Moderate rain (total 12mm), heaviest on Tue morning. Warm (max 23°C on Tue afternoon, min 9°C on Sat night). Wind will be generally light.

Days 11–13 Weather Summary

Mostly dry. Warm (max 26°C on Thu afternoon, min 14°C on Tue night). Wind will be generally light.

Days 14–17 Weather Summary

Moderate rain (total 12mm), heaviest on Mon afternoon. Warm (max 28°C on Sun afternoon, min 12°C on Fri night). Winds increasing (calm on Fri night, fresh winds from the NW by Tue afternoon).

Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
Wednesday
27
Thursday
28
Friday
29
Saturday
30
Sunday
31
Monday
1
Tue
2
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
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
Wave Height Map
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High Tide
00:11AM3.37m
12:57PM2.85m
1:04AM3.35m
1:53PM2.81m
2:00AM3.27m
2:50PM2.76m
2:58AM3.15m
3:51PM2.71m
4:01AM3.00m
4:53PM2.68m
5:06AM2.85m
5:56PM2.67m
6:13AM2.73m
6:57PM2.69m
7:18AM2.64m
7:54PM2.73m
8:19AM2.58m
8:46PM2.77m
9:16AM2.55m
9:33PM2.81m
10:06AM2.52m
10:17PM2.83m
10:53AM2.51m
10:56PM2.84m
11:35AM2.48m
11:33PM2.84m
12:14PM2.46m
Low Tide
5:55PM-0.04m
6:40AM-0.45m
6:48PM-0.02m
7:35AM-0.42m
7:43PM0.05m
8:30AM-0.34m
8:42PM0.13m
9:29AM-0.23m
9:44PM0.21m
10:29AM-0.10m
10:50PM0.27m
11:31AM0.02m
11:58PM0.30m
12:32PM0.12m
1:04AM0.29m
1:30PM0.19m
2:07AM0.24m
2:25PM0.25m
3:03AM0.18m
3:14PM0.30m
3:54AM0.13m
4:00PM0.34m
4:40AM0.09m
4:42PM0.38m
5:22AM0.07m
5:21PM0.41m
6:01AM0.06m
5:57PM0.44m
Wave
Height (m)
Direction
Period (s)
0.5
SE
8
0.4
SE
8
0.5
SE
8
0.5
SE
4
0.5
SE
9
0.6
SE
9
0.6
SSE
7
0.6
SE
8
0.6
W
3
0.4
SE
9
0.4
NE
5
0.5
SE
9
0.3
SE
9
0.2
ESE
9
0.8
SSE
4
0.4
SSE
4
0.2
ESE
10
0.6
S
3
0.2
ESE
13
0.4
SE
7
0.5
SE
7
0.6
SE
7
0.6
SE
7
0.6
SE
7
0.8
SE
8
1.2
SE
8
1.1
SE
7
1
SE
8
0.9
SE
8
0.7
SE
8
0.8
ESE
8
0.7
SE
8
0.6
ESE
8
0.6
ESE
8
0.5
ESE
8
0.6
ESE
8
0.5
ESE
8
0.5
ESE
9
0.5
E
10
0.4
ESE
9
0.4
ESE
9
0.5
E
9
0.4
ESE
8
0.3
ESE
8
0.4
ESE
8
0.6
ESE
8
0.6
W
3
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
cloud
cloud
part cloud
part cloud
cloud
cloud
part cloud
clear
part cloud
rain showers
heavy rain
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
part cloud
mod rain
rain showers
clear
some clouds
some clouds
some clouds
some clouds
some clouds
clear
clear
clear
clear
some clouds
clear
clear
clear
clear
some clouds
cloudy
cloudy
some clouds
some clouds
cloudy
cloudy
some clouds
clear
some clouds
rain shwrs
heavy rain
some clouds
clear
some clouds
some clouds
clear
clear
some clouds
some clouds
clear
some clouds
clear
clear
clear
clear
clear
some clouds
clear
some clouds
mod rain
rain shwrs
clear
km/h
10
ENE
15
ESE
20
SE
10
SSW
20
SW
25
WNW
20
SW
25
WSW
30
WNW
20
NW
5
SE
5
WSW
10
NW
10
S
25
S
10
WSW
5
SE
20
S
5
SW
10
ESE
10
SE
5
WNW
10
SE
15
SSE
15
SSE
20
SSW
15
SSW
15
SW
25
WNW
20
NW
15
WNW
15
NNW
15
N
5
NNW
10
ENE
15
SSE
5
SW
10
ENE
15
SSE
10
WSW
5
SW
15
E
5
NE
10
SE
10
WNW
20
SW
25
WNW
1
11
7
5
max °C
25
13
13
20
30
33
28
30
31
21
12
16
16
14
16
15
14
15
11
12
13
13
13
13
12
15
23
21
20
22
20
22
26
21
18
17
15
16
17
20
27
28
24
21
21
19
19
Moonrise
6:16
7:25
8:42
10:01
11:18
12:30
1:39
2:45
3:50
4:55
6:01
7:06
8:09
9:08
10:01
Moonset
9:46
10:56
11:51
12:33
1:05
1:31
1:52
2:12
2:30
2:50
3:11
3:36
4:06
4:43
5:28
6:21
Sunrise
5:16
5:15
5:13
5:13
5:13
5:11
5:11
5:09
5:09
5:09
5:07
5:07
5:07
5:05
5:05
5:05
Sunset
8:00
8:01
8:02
8:04
8:05
8:06
8:07
8:07
8:08
8:08
8:09
8:10
8:12
8:13
8:14
8:15
Today's sea temperature in Gerrish Island, Portsmouth Harbor is
8.5° C
(Statistics for 17 May 1981-2005 – mean: 9.1 max: 11.1 min: 7.3°C)
Issued (local time): 7 pm Sunday 17 May 2026
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest