Plum Island Sound (south end) Sea Conditions and Tide Table

Plum Island Sound (south end) 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 06:58 AM and sunset is at 04:08 PM.

Days 1–3 Weather Summary

Mostly dry. Icy conditions (max 3°C on Sun afternoon, min -7°C on Mon morning). Mainly fresh winds.

Days 4–6 Weather Summary

Light rain (total 4mm), mostly falling on Wed night. Icy conditions (max 8°C on Wed afternoon, min -1°C on Thu afternoon). Winds decreasing (fresh winds from the SW on Wed afternoon, light winds from the WSW by Thu night).

Days 7–9 Weather Summary

Mostly dry. Temperatures will be below freezing (max -1°C on Sat morning, min -7°C on Sat night). Wind will be generally light.

Days 10–12 Weather Summary

Mostly dry. Freeze-thaw conditions (max 3°C on Thu night, min -4°C on Tue afternoon). Winds increasing (light winds from the NNW on Mon night, strong winds from the N by Tue night).

Sunday
7
Monday
8
Tuesday
9
Wednesday
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thu
18
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
12:51PM3.32m
1:29AM2.73m
1:44PM3.21m
2:23AM2.70m
2:39PM3.07m
3:18AM2.67m
3:35PM2.90m
4:13AM2.64m
4:32PM2.73m
5:09AM2.63m
5:31PM2.58m
6:05AM2.63m
6:29PM2.46m
6:58AM2.64m
7:26PM2.38m
7:49AM2.65m
8:20PM2.33m
8:36AM2.66m
9:10PM2.31m
9:21AM2.68m
9:56PM2.30m
10:03AM2.70m
Low Tide
7:24PM-0.35m
7:34AM0.02m
8:17PM-0.26m
8:29AM0.09m
9:10PM-0.16m
9:27AM0.16m
10:04PM-0.04m
10:26AM0.23m
10:58PM0.08m
11:26AM0.27m
11:52PM0.18m
12:25PM0.28m
00:45AM0.27m
1:22PM0.27m
1:36AM0.35m
2:16PM0.24m
2:25AM0.40m
3:06PM0.21m
3:12AM0.44m
3:52PM0.18m
3:56AM0.46m
4:35PM0.16m
Wave
height (m) 
direction
period (s) 
0.4
SE
9
0.6
ESE
9
0.8
ESE
9
1
N
4
0.8
E
8
0.6
E
8
0.3
E
9
0.5
SE
5
0.9
S
4
0.6
SSW
4
1.2
S
5
1
SSW
4
0.5
W
3
0.4
WNW
3
0.3
SE
10
0.3
SE
8
0.5
NE
4
0.5
NW
3
0.4
SE
7
0.2
ESE
8
0.3
ESE
8
0.3
ENE
4
0.6
NW
3
0.5
WNW
3
0.3
SSW
4
0.2
ESE
9
0.2
ESE
9
1.4
NE
5
2.1
NE
6
2.5
E
9
2.5
E
10
2.2
E
11
1.5
E
11
1
E
11
0.9
E
10
part cloud
cloud
clear
clear
clear
clear
part cloud
cloud
light rain
cloud
light rain
rain showers
clear
part cloud
cloud
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
part cloud
cloud
cloud
cloud
cloud
part cloud
clear
clear
clear
part cloud
part cloud
some clouds
cloudy
clear
clear
clear
clear
some clouds
cloudy
light rain
cloudy
light rain
rain shwrs
clear
some clouds
cloudy
some clouds
some clouds
clear
some clouds
clear
clear
clear
clear
some clouds
some clouds
cloudy
cloudy
cloudy
cloudy
some clouds
clear
clear
clear
some clouds
some clouds
 km/h
15
NW
5
SSW
30
W
35
NNW
20
NW
15
NW
15
SW
25
SSW
30
SW
25
SSW
35
SW
30
WSW
25
WNW
20
WNW
10
WSW
15
WNW
20
NW
20
WNW
15
NW
10
NW
15
NW
15
NW
30
NW
20
WNW
15
W
10
WNW
15
NNE
35
NNE
40
NNE
40
N
20
NNW
25
NW
20
NW
10
SSW
25
SSW
 mm 
1
1
2
max°C
2
3
1
-6
-5
-7
-2
0
3
7
8
6
1
1
-1
2
1
-3
-1
-1
-4
-3
-3
-4
-2
-1
-1
-1
-2
-2
1
0
-1
2
2
Moonrise
7:04
8:22
9:35
10:45
11:51
12:54
1:57
3:00
4:05
5:09
6:11
Moonset
10:00
10:38
11:07
11:31
11:51
12:09
12:27
12:47
1:08
1:34
2:04
2:43
Sunrise
6:58
7:00
7:01
7:01
7:03
7:03
7:03
7:05
7:05
7:07
7:07
7:07
Sunset
4:08
4:08
4:08
4:08
4:08
4:08
4:08
4:08
4:09
4:09
4:09
4:10
Today's sea temperature in Plum Island Sound (south end) is
8.4° C
(Statistics for 07 Dec 1981-2005 – mean: 8.2 max: 9.9 min: 6.7°C)
Issued (local time): 12 am Sunday 07 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest