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 05:16 AM and sunset is at 08:13 PM.

Days 1–3 Weather Summary

Mostly dry. Warm air temperatures (max 23°C on Mon afternoon, min 16°C on Sat afternoon). Wind will be generally light.

Days 4–6 Weather Summary

Light rain (total 3mm), mostly falling on Thu morning. Warm air temperatures (max 25°C on Tue afternoon, min 22°C on Wed night). Mainly fresh winds.

Days 7–9 Weather Summary

Light rain (total 5mm), mostly falling on Fri night. Warm (max 25°C on Sun night, min 22°C on Sat afternoon). Winds increasing (light winds from the E on Sat night, fresh winds from the SW by Sun night).

Days 10–12 Weather Summary

Heavy rain (total 24mm), heaviest during Mon night. Warm (max 23°C on Mon morning, min 17°C on Tue afternoon). Winds decreasing (strong winds from the SW on Mon afternoon, light winds from the SW by Wed night).

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
Wednesday
23
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
1:38PM0.36m
1:41AM0.42m
2:19PM0.37m
2:24AM0.42m
3:01PM0.38m
3:10AM0.42m
3:45PM0.40m
3:59AM0.41m
4:32PM0.41m
4:52AM0.40m
5:22PM0.41m
5:48AM0.38m
6:15PM0.42m
6:48AM0.37m
7:11PM0.42m
7:51AM0.36m
8:11PM0.43m
8:55AM0.36m
9:11PM0.44m
9:58AM0.36m
10:11PM0.44m
10:58AM0.37m
11:08PM0.45m
Low Tide
7:28AM-0.00m
7:34PM0.04m
8:09AM-0.01m
8:19PM0.03m
8:51AM-0.01m
9:06PM0.02m
9:35AM-0.01m
9:55PM0.02m
10:21AM-0.01m
10:48PM0.02m
11:10AM0.00m
11:44PM0.01m
12:02PM0.01m
00:43AM0.01m
12:58PM0.02m
1:45AM0.00m
1:57PM0.03m
2:48AM-0.00m
2:57PM0.03m
3:49AM-0.01m
3:57PM0.03m
4:47AM-0.02m
4:54PM0.02m
Wave
height (m) 
direction
period (s) 
0.8
S
7.0
0.8
S
7.0
0.9
S
8.0
0.8
S
7.0
0.8
S
7.0
0.8
SSE
6.0
0.7
SE
6.0
0.6
SE
6.0
0.6
SE
6.0
0.6
SE
6.0
0.7
S
4.0
0.6
SW
4.0
0.8
S
5.0
0.9
SSW
5.0
1
SSW
6.0
0.9
SSW
6.0
0.9
SSW
6.0
1.1
SSW
7.0
1.1
SSW
8.0
1.1
SSW
7.0
0.9
SSW
7.0
1
S
7.0
0.9
SSW
7.0
0.7
S
7.0
0.9
S
7.0
1
S
7.0
1
SSW
5.0
1.5
SSW
6.0
1.7
SSW
7.0
1.4
SSW
8.0
1.5
S
8.0
1.3
S
8.0
0.9
SSW
8.0
0.8
SSW
7.0
0.7
S
7.0
0.5
S
7.0
cloud
clear
clear
clear
clear
clear
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
cloud
rain showers
clear
clear
part cloud
clear
rain showers
clear
clear
clear
clear
clear
clear
rain showers
part cloud
heavy rain
part cloud
clear
clear
clear
clear
part cloud
cloudy
clear
clear
clear
clear
clear
some clouds
clear
some clouds
clear
clear
clear
clear
some clouds
cloudy
rain shwrs
clear
clear
some clouds
clear
rain shwrs
clear
clear
clear
clear
clear
clear
rain shwrs
some clouds
heavy rain
some clouds
clear
clear
clear
clear
some clouds
 km/h
20
ESE
20
ESE
20
ESE
20
ESE
20
ESE
15
ESE
5
NE
10
SW
20
WSW
25
SW
25
SW
20
WSW
25
SW
30
SW
25
SW
20
SSW
20
SSW
20
SW
20
SSW
30
SW
15
WSW
15
NNW
10
ENE
15
SSE
25
SSE
25
SW
30
SW
35
SW
45
SW
35
NNE
40
NNE
25
NE
15
N
25
NNE
25
NNE
10
WNW
 mm 
3
5
1
22
max°C
17
17
19
20
20
21
22
23
23
23
25
25
25
25
24
23
23
24
23
23
24
23
23
23
24
24
25
23
23
23
19
17
19
19
19
20
Moonrise
9:46
10:12
10:35
10:57
11:20
11:44
12:13
12:48
1:33
2:30
3:37
Moonset
6:49
8:01
9:12
10:23
11:35
12:47
2:03
3:21
4:39
5:52
6:55
7:46
Sunrise
5:16
5:16
5:18
5:18
5:20
5:20
5:20
5:22
5:22
5:24
5:24
5:26
Sunset
8:13
8:12
8:12
8:10
8:10
8:09
8:08
8:08
8:07
8:07
8:06
8:05
Today's sea temperature in Siasconset, Nantucket Island is 18.6 °C (Statistics for 12 Jul 1981-2005 – mean: 19.5 max: 21.5 min: 17.6°C)
Issued (local time): 1 am Saturday 12 Jul 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest