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 07:01 AM and sunset is at 04:12 PM.

Days 1–3 Weather Summary

Moderate rain (total 11mm), heaviest on Fri morning. Icy conditions (max 14°C on Thu night, min -1°C on Fri night). Winds decreasing (severe gales from the WSW on Fri night, light winds from the WSW by Sat afternoon).

Days 4–6 Weather Summary

Light rain (total 6mm), mostly falling on Tue afternoon. Icy conditions (max 5°C on Tue afternoon, min -4°C on Mon morning). Winds decreasing (strong winds from the NW on Sun night, light winds from the W by Mon night).

Days 7–9 Weather Summary

Light rain (total 7mm), mostly falling on Thu night. Freeze-thaw conditions (max 10°C on Thu night, min 0°C on Wed night). Mainly near gales.

Days 10–12 Weather Summary

A light covering of new snow, mostly falling on Mon night. Freeze-thaw conditions (max 4°C on Sat night, min 0°C on Sun night). Winds increasing (light winds from the NNW on Sat night, gales from the NE by Tue afternoon).

Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tue
30
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
10:49AM0.39m
11:29PM0.34m
11:28AM0.40m
00:08AM0.34m
12:07PM0.40m
00:47AM0.34m
12:46PM0.40m
1:27AM0.34m
1:27PM0.39m
2:07AM0.35m
2:10PM0.39m
2:50AM0.35m
2:56PM0.38m
3:35AM0.36m
3:46PM0.38m
4:22AM0.37m
4:40PM0.37m
5:13AM0.39m
5:38PM0.36m
6:07AM0.40m
6:39PM0.36m
7:02AM0.42m
Low Tide
5:19PM0.02m
5:19AM0.06m
5:57PM0.01m
5:59AM0.06m
6:36PM0.01m
6:40AM0.05m
7:16PM0.01m
7:22AM0.05m
7:56PM0.01m
8:06AM0.05m
8:38PM0.01m
8:52AM0.05m
9:23PM0.01m
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
Wave
height (m) 
direction
period (s) 
1.9
SSE
7
3.5
S
11
3.5
S
12
2.3
S
11
1.5
S
10
1.5
S
9
2.1
SSW
8
2
SSW
8
1.6
W
6
1.6
NW
5
1.3
NW
5
0.8
NNE
7
0.6
SW
3
1.6
SW
6
1.6
SW
7
1.4
W
5
1.1
W
5
0.7
NNE
7
0.8
SW
4
1.2
SW
6
1
SSW
6
2.3
SSW
8
2.5
SSW
9
1.7
SSW
9
1.1
SSW
8
0.8
SSW
8
0.6
S
7
1
NE
5
1
NE
6
1.1
NE
7
0.8
NE
7
0.7
NE
7
1.1
ENE
4
2.1
ENE
6
2.5
E
8
mod rain
light rain
rain showers
clear
part cloud
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
cloud
mod rain
clear
clear
clear
part cloud
cloud
light rain
light rain
light rain
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
cloud
cloud
light snow
light snow
light snow
mod rain
light rain
rain shwrs
clear
some clouds
some clouds
clear
some clouds
some clouds
clear
clear
some clouds
cloudy
mod rain
clear
clear
clear
some clouds
cloudy
light rain
light rain
light rain
clear
clear
clear
clear
some clouds
some clouds
clear
some clouds
cloudy
cloudy
light snow
light snow
light snow
 km/h
45
SSE
60
SSW
60
W
40
WNW
15
WSW
40
SSW
40
WSW
45
W
45
WNW
50
NW
40
NW
20
NW
30
SW
45
SSW
40
WNW
40
NW
35
NNW
15
WNW
35
SW
30
SW
10
SSW
50
SW
50
WSW
30
WNW
20
WNW
10
NNW
20
NNW
30
NNE
30
N
30
NNE
15
NNE
20
ENE
35
ENE
60
NE
65
NE
 mm 
6
4
1
6
1
5
1
max°C
12
11
3
1
2
9
7
6
-1
-2
-1
0
4
5
3
3
3
2
5
7
10
10
9
6
4
4
4
2
2
1
1
1
1
2
1
Moonrise
7:00
7:52
8:36
9:13
9:43
10:09
10:32
10:54
11:15
11:38
12:05
12:38
Moonset
3:33
4:28
5:30
6:36
7:43
8:51
9:58
11:06
12:16
1:30
2:47
Sunrise
7:01
7:01
7:01
7:01
7:03
7:03
7:03
7:03
7:03
7:03
7:05
7:05
Sunset
4:12
4:13
4:13
4:14
4:14
4:15
4:15
4:15
4:16
4:17
4:17
4:19
Today's sea temperature in Siasconset, Nantucket Island is
6.0° C
(Statistics for 19 Dec 1981-2005 – mean: 8.7 max: 11.4 min: 7.0°C)
Issued (local time): 12 am Friday 19 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest