Siasconset, Nantucket Island Sea Conditions and Tide Table

Siasconset, Nantucket Island 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 07:03 AM and sunset is at 04:15 PM.

Days 1–3 Weather Summary

A dusting of new snow. Icy conditions (max 3°C on Sun afternoon, min -4°C on Thu night). Winds decreasing (near gales from the NNW on Thu night, light winds from the NE by Fri night).

Days 4–6 Weather Summary

Moderate rain (total 19mm), heaviest on Sun night. Icy conditions (max 9°C on Mon afternoon, min -1°C on Tue night). Winds increasing (moderate winds from the SSW on Sun night, gales from the W by Tue morning).

Days 7–9 Weather Summary

Mostly dry. Freeze-thaw conditions (max 2°C on Wed night, min -4°C on Fri night). Mainly strong winds.

Days 10–12 Weather Summary

Mostly dry. Freeze-thaw conditions (max 6°C on Mon morning, min -5°C on Sat night). Winds increasing (light winds from the WSW on Sun morning, near gales from the N by Tue night).

Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thursday
1
Friday
2
Saturday
3
Sunday
4
Monday
5
Tue
6
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
3:46PM0.38m
4:22AM0.37m
4:40PM0.37m
5:13AM0.39m
5:38PM0.36m
6:07AM0.40m
6:39PM0.36m
7:02AM0.42m
7:40PM0.37m
7:58AM0.44m
8:39PM0.37m
8:53AM0.45m
9:39PM0.37m
9:51AM0.46m
10:36PM0.38m
10:46AM0.47m
11:31PM0.39m
11:41AM0.47m
00:24AM0.40m
12:34PM0.46m
1:15AM0.40m
1:26PM0.44m
Low Tide
9:43AM0.05m
10:10PM0.02m
10:37AM0.04m
11:01PM0.02m
11:35AM0.03m
11:54PM0.02m
12:35PM0.01m
00:50AM0.02m
1:35PM-0.01m
1:47AM0.02m
2:35PM-0.02m
2:43AM0.02m
3:31PM-0.04m
3:40AM0.01m
4:27PM-0.05m
4:35AM-0.00m
5:21PM-0.06m
5:29AM-0.01m
6:12PM-0.06m
6:22AM-0.01m
7:02PM-0.05m
7:15AM-0.00m
Wave
height (m) 
direction
period (s) 
1.5
NE
8
1.1
NE
8
0.8
ENE
10
1.2
E
12
1.2
E
12
0.9
E
12
0.9
E
12
0.7
E
12
0.7
SW
5
1
S
4
1.8
SSW
8
3
SSW
10
3
SW
11
3
SW
10
2.5
SW
10
2.1
SW
8
1.9
SW
8
1.5
SW
8
1.3
SW
7
1.2
W
5
1.4
WSW
6
1
WSW
5
1
WSW
5
1
W
5
0.8
W
4
0.9
W
4
0.9
WNW
4
0.4
S
7
0.4
S
6
0.8
SW
4
1.3
SW
5
1.2
SW
6
1.1
NW
4
1.7
NNE
6
2.1
NNE
8
cloud
cloud
light snow
cloud
part cloud
clear
clear
part cloud
mod rain
light rain
light rain
rain showers
part cloud
part cloud
part cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
part cloud
cloud
clear
clear
cloud
clear
clear
part cloud
part cloud
part cloud
clear
part cloud
cloud
cloud
cloudy
cloudy
light snow
cloudy
some clouds
clear
clear
some clouds
mod rain
light rain
light rain
rain shwrs
some clouds
some clouds
some clouds
cloudy
cloudy
cloudy
cloudy
some clouds
some clouds
some clouds
cloudy
clear
clear
cloudy
clear
clear
some clouds
some clouds
some clouds
clear
some clouds
cloudy
cloudy
 km/h
40
N
20
N
15
NE
30
NNE
35
N
25
NW
30
WNW
20
W
20
WSW
30
SSE
40
SW
65
W
70
W
70
W
60
W
50
W
45
W
35
W
35
WNW
40
WNW
35
WNW
30
WNW
30
WNW
35
NW
30
WNW
30
WNW
30
NW
15
WNW
20
SW
30
SW
35
WSW
35
WNW
40
NNW
50
N
55
N
 mm 
10
5
1
3
max°C
-4
-3
-2
0
-1
-2
0
3
6
8
9
6
0
0
0
1
2
2
-1
-2
-2
-3
-2
-3
-4
-1
-3
-5
-1
5
6
3
0
-4
-4
Moonrise
10:54
11:15
11:38
12:05
12:38
1:19
2:13
3:20
4:36
5:55
7:12
8:24
Moonset
11:06
12:16
1:30
2:47
4:08
5:27
6:38
7:36
8:22
8:57
9:25
Sunrise
7:03
7:03
7:03
7:05
7:05
7:05
7:05
7:05
7:05
7:05
7:05
7:05
Sunset
4:15
4:16
4:17
4:17
4:19
4:20
4:21
4:22
4:22
4:23
4:24
4:25
Today's sea temperature in Siasconset, Nantucket Island is
4.7° C
(Statistics for 26 Dec 1981-2005 – mean: 8.1 max: 10.1 min: 6.1°C)
Issued (local time): 12 am Friday 26 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
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