Wychmere Harbor, Nantucket Sound Sea Conditions and Tide Table

Wychmere Harbor, Nantucket Sound 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 07:00 AM and sunset is at 04:09 PM.

Days 1–3 Weather Summary

Mostly dry. Icy conditions (max 8°C on Wed morning, min -6°C on Mon morning). Winds decreasing (strong winds from the SW on Wed morning, light winds from the WNW by Wed night).

Days 4–6 Weather Summary

Moderate rain (total 10mm), heaviest on Fri morning. Icy conditions (max 12°C on Fri morning, min -4°C on Fri night). Winds decreasing (gales from the S on Fri morning, light winds from the SW by Sat afternoon).

Days 7–9 Weather Summary

Moderate rain (total 13mm), heaviest on Tue morning. Freeze-thaw conditions (max 9°C on Tue afternoon, min -5°C on Tue night). Winds increasing (calm on Mon night, near gales from the WNW by Tue night).

Days 10–12 Weather Summary

Light rain (total 6mm), mostly falling on Sat morning. Freeze-thaw conditions (max 9°C on Sat morning, min -6°C on Wed morning). Winds increasing (calm on Fri morning, strong winds from the SSW by Sat morning).

Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
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
8:34AM1.10m
9:11PM0.99m
9:22AM1.12m
10:00PM0.99m
10:04AM1.14m
10:43PM0.99m
10:44AM1.16m
11:24PM1.00m
11:23AM1.17m
00:04AM1.00m
12:02PM1.18m
00:44AM1.01m
12:42PM1.18m
1:23AM1.01m
1:22PM1.18m
2:02AM1.01m
2:02PM1.17m
2:42AM1.03m
2:44PM1.16m
3:22AM1.05m
3:29PM1.14m
4:06AM1.07m
4:18PM1.12m
4:54AM1.10m
Low Tide
2:29PM0.13m
2:36AM0.20m
3:20PM0.11m
3:21AM0.20m
4:04PM0.08m
4:03AM0.19m
4:44PM0.06m
4:44AM0.18m
5:23PM0.05m
5:24AM0.17m
6:02PM0.04m
6:03AM0.17m
6:41PM0.03m
6:44AM0.16m
7:20PM0.02m
7:26AM0.16m
8:00PM0.02m
8:08AM0.16m
8:41PM0.03m
8:54AM0.15m
9:25PM0.03m
9:45AM0.14m
10:13PM0.04m
Wave
height (m) 
direction
period (s) 
1
NNE
6
0.8
NW
4
0.6
W
3
0.4
NNE
5
0.5
SW
3
0.7
SW
4
1
SSW
4
1
SSW
5
1
WNW
4
0.3
ENE
6
0.5
SSE
3
1.1
SSE
5
1.6
SE
7
1.4
ESE
11
1.6
ESE
12
0.9
ESE
11
0.6
ESE
10
0.8
SSE
5
1.2
SSW
5
0.9
S
5
0.9
W
4
0.8
NNW
4
0.5
N
4
0.3
E
12
0.9
SE
4
1.2
S
5
1.3
WNW
4
1.1
NW
4
0.6
NNE
5
0.4
NE
5
0.5
W
3
0.6
NW
3
0.7
NNW
3
0.4
NE
6
0.3
NE
5
0.7
SE
4
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
part cloud
clear
clear
clear
part cloud
mod rain
rain showers
part cloud
part cloud
part cloud
part cloud
cloud
clear
clear
clear
cloud
cloud
mod rain
light rain
part cloud
clear
part cloud
clear
clear
clear
clear
clear
part cloud
light rain
some clouds
some clouds
some clouds
clear
clear
some clouds
clear
some clouds
clear
clear
clear
some clouds
mod rain
rain shwrs
some clouds
some clouds
some clouds
some clouds
cloudy
clear
clear
clear
cloudy
cloudy
mod rain
light rain
some clouds
clear
some clouds
clear
clear
clear
clear
clear
some clouds
light rain
 km/h
35
NW
35
WNW
25
W
20
W
20
WSW
30
SW
40
SW
40
SW
40
WNW
10
S
30
S
40
S
60
SSE
25
WSW
50
W
25
NW
10
SW
30
SSW
45
SSW
30
WSW
40
W
30
NW
20
NNW
10
SSE
40
SSE
40
SW
50
WNW
35
NW
20
W
15
W
25
WNW
30
WNW
25
NW
5
N
20
S
30
S
 mm 
9
1
9
4
3
max°C
-4
-3
-1
-1
0
6
8
7
4
2
7
11
12
8
1
-2
0
7
8
6
4
-1
-1
1
7
9
4
-3
-1
-1
0
1
-2
-1
0
8
Moonrise
2:55
3:58
5:02
6:04
7:02
7:54
8:38
9:15
9:45
10:10
10:33
10:54
Moonset
1:08
1:34
2:06
2:44
3:31
4:27
5:29
6:35
7:43
8:50
9:58
11:07
Sunrise
7:00
7:00
7:01
7:01
7:01
7:03
7:03
7:03
7:03
7:05
7:05
7:05
Sunset
4:09
4:09
4:10
4:10
4:12
4:12
4:12
4:13
4:14
4:14
4:15
4:15
Today's sea temperature in Wychmere Harbor, Nantucket Sound is
6.6° C
(Statistics for 15 Dec 1981-2005 – mean: 8.4 max: 10.5 min: 6.9°C)
Issued (local time): 6 am Monday 15 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
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