Block Island (Old Harbor) Sea Conditions and Tide Table

Block Island (Old Harbor) 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 06:50 AM and sunset is at 06:57 PM.

Days 1–3 Weather Summary

Some drizzle, heaviest during Wed night. Icy conditions (max 8°C on Wed night, min -3°C on Thu night). Winds increasing (moderate winds from the W on Tue night, strong winds from the WNW by Thu morning).

Days 4–6 Weather Summary

Heavy rain (total 37mm), heaviest during Sat night. Icy conditions (max 11°C on Sat afternoon, min -4°C on Fri morning). Winds increasing (moderate winds from the WNW on Fri morning, near gales from the S by Sat afternoon).

Days 7–9 Weather Summary

Some drizzle, heaviest during Wed morning. Freeze-thaw conditions (max 11°C on Wed night, min -2°C on Mon morning). Winds decreasing (strong winds from the NE on Mon morning, calm by Wed afternoon).

Days 10–12 Weather Summary

Moderate rain (total 17mm), heaviest on Sat morning. Freeze-thaw conditions (max 15°C on Thu night, min -3°C on Sun morning). Winds increasing (light winds from the WNW on Fri morning, near gales from the NNW by Sat night).

Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
Wednesday
27
Thursday
28
Friday
29
Saturday
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
night
Wave Height Map
High Tide
4:56PM0.66m
5:38AM0.76m
5:52PM0.72m
6:25AM0.79m
6:38PM0.79m
7:03AM0.82m
7:16PM0.85m
7:35AM0.84m
7:50PM0.90m
8:04AM0.86m
8:20PM0.93m
8:32AM0.86m
8:50PM0.95m
9:01AM0.84m
9:20PM0.95m
9:32AM0.81m
9:52PM0.94m
10:07AM0.78m
10:28PM0.92m
10:46AM0.74m
11:08PM0.89m
11:31AM0.70m
11:54PM0.86m
Low Tide
11:15AM0.14m
11:05PM0.14m
12:02PM0.12m
11:57PM0.10m
12:42PM0.08m
00:40AM0.06m
1:15PM0.04m
1:19AM0.02m
1:45PM0.00m
1:54AM-0.02m
2:10PM-0.02m
2:27AM-0.04m
2:31PM-0.03m
2:59AM-0.04m
2:51PM-0.03m
3:29AM-0.02m
3:15PM-0.02m
3:58AM0.01m
3:44PM0.00m
4:30AM0.05m
4:17PM0.03m
5:08AM0.09m
4:57PM0.07m
Wave
height (m) 
direction
period (s) 
0.9
W
4
1
WSW
4
0.9
WSW
4
1
SW
4
0.9
SSW
5
1.3
W
4
1.4
W
4
1.4
W
5
1
WNW
4
0.4
WNW
3
0.4
WSW
3
0.5
S
3
1.8
SE
6
2.5
SSE
8
2.4
SSE
11
1.9
SSE
11
1.7
SSE
11
1.4
SSE
11
1.5
SSE
10
1.4
SE
10
1.5
SE
11
1.4
SE
11
1.2
SE
10
1.1
SE
10
0.9
SE
9
0.8
SE
9
0.8
SE
9
0.8
SE
9
0.8
SE
9
0.8
SE
9
0.6
SE
9
0.7
SE
9
0.9
SSE
6
1.5
S
6
1.3
WSW
5
1.3
N
5
clear
part cloud
cloud
clear
clear
rain showers
part cloud
clear
clear
clear
clear
rain showers
light rain
heavy rain
rain showers
clear
clear
clear
clear
clear
clear
cloud
cloud
cloud
light rain
cloud
cloud
light rain
cloud
clear
clear
part cloud
rain showers
mod rain
part cloud
clear
clear
some clouds
cloudy
clear
clear
rain shwrs
some clouds
clear
clear
clear
clear
rain shwrs
light rain
heavy rain
rain shwrs
clear
clear
clear
clear
clear
clear
cloudy
cloudy
cloudy
light rain
cloudy
cloudy
light rain
cloudy
clear
clear
some clouds
rain shwrs
mod rain
some clouds
clear
 km/h
35
WNW
35
WSW
30
WSW
35
W
30
SW
45
WNW
50
WNW
50
WNW
35
NW
20
WNW
25
SW
25
S
50
SE
60
S
45
NW
35
NNW
30
N
30
NE
40
NE
40
ENE
35
NE
35
NE
30
ENE
25
ENE
15
NNE
10
SW
20
SW
15
SW
20
WSW
35
NNW
10
WNW
25
SSW
35
S
40
WSW
50
NNW
50
NNW
 mm 
1.0
1.0
2.0
15
19
1.0
5
3
9
max°C
2
6
6
7
7
8
0
3
1
-3
1
3
8
11
10
-1
4
2
0
1
-1
1
4
4
6
8
11
11
14
15
6
7
7
10
6
3
Moonrise
1:26
2:31
3:34
4:36
5:37
6:37
7:38
8:39
9:43
10:48
11:56
Moonset
4:28
5:02
5:31
5:54
6:15
6:33
6:52
7:10
7:30
7:54
8:22
8:57
Sunrise
6:50
6:48
6:47
6:45
6:43
6:41
6:39
6:37
6:37
6:35
6:33
6:31
Sunset
6:57
6:58
7:00
7:00
7:01
7:02
7:04
7:05
7:06
7:07
7:07
7:08
Today's sea temperature in Block Island (Old Harbor) is 5.8 °C (Statistics for 19 Mar 1981-2005 – mean: 4.7 max: 6.5 min: 3.0°C)
Nearest