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 — and sunset is at 06:53 PM.

Days 1–4 Weather Summary

Mostly dry. Icy conditions (max 4°C on Fri afternoon, min -3°C on Wed morning). Winds decreasing (fresh winds from the WNW on Tue night, calm by Thu morning).

Days 5–7 Weather Summary

Light rain (total 6mm), mostly falling on Mon morning. Low air temperatures (max 9°C on Mon morning, min 5°C on Fri night). Winds increasing (calm on Sat night, strong winds from the SW by Sun night).

Days 8–10 Weather Summary

Mostly dry. Freeze-thaw conditions (max 9°C on Wed afternoon, min -3°C on Wed night). Mainly fresh winds.

Days 11–13 Weather Summary

Heavy rain (total 26mm), heaviest during Fri afternoon. Freeze-thaw conditions (max 11°C on Fri morning, min -4°C on Sat night). Winds decreasing (near gales from the S on Fri morning, light winds from the NE by Fri night).

Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Thursday
26
Friday
27
Saturday
28
Sunday
29
Monday
30
Tuesday
31
Wednesday
1
Thu
2
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
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
Wave Height Map
High Tide
7:29PM0.93m
7:51AM0.94m
8:08PM1.02m
8:30AM0.96m
8:49PM1.08m
9:12AM0.95m
9:32PM1.11m
9:57AM0.92m
10:18PM1.11m
10:46AM0.87m
11:08PM1.07m
11:38AM0.81m
00:03AM1.01m
12:35PM0.76m
1:03AM0.94m
1:39PM0.73m
2:12AM0.88m
2:50PM0.72m
3:30AM0.85m
4:06PM0.76m
4:45AM0.85m
5:13PM0.83m
5:46AM0.87m
6:09PM0.91m
6:35AM0.90m
6:56PM0.98m
7:18AM0.91m
7:39PM1.03m
Low Tide
1:49AM-0.11m
1:58PM-0.14m
2:29AM-0.15m
2:28PM-0.18m
3:08AM-0.16m
3:00PM-0.19m
3:50AM-0.15m
3:37PM-0.18m
4:35AM-0.11m
4:17PM-0.15m
5:28AM-0.05m
5:04PM-0.09m
6:43AM0.02m
5:58PM-0.03m
8:16AM0.06m
7:11PM0.04m
9:31AM0.06m
9:05PM0.06m
10:34AM0.04m
10:29PM0.03m
11:27AM0.01m
11:34PM-0.01m
12:14PM-0.03m
00:28AM-0.04m
12:55PM-0.06m
1:15AM-0.07m
1:31PM-0.09m
Wave
height (m) 
direction
period (s) 
1.4
SSE
10
1.1
SSE
10
1
SSE
10
0.9
SSE
9
0.7
SSE
9
0.7
SSE
8
0.6
SE
8
0.6
SE
8
0.7
SE
8
0.6
SE
9
0.6
SE
8
0.6
SE
8
1
SSE
7
0.9
SSE
7
0.9
SSE
7
1.4
S
6
1
SSE
7
1
SSE
7
0.9
SE
8
0.8
SSE
8
0.6
SE
8
0.5
SE
8
0.6
S
4
0.6
S
5
0.6
E
5
0.6
SE
8
0.9
SE
4
1.4
SE
5
2.2
SSE
7
1.6
SSE
8
1.3
SSE
8
1.2
SSE
8
0.9
SSE
8
1
SSE
8
0.6
SE
8
0.5
SE
8
0.7
NNE
3
0.4
SE
8
0.6
WSW
3
0.4
SE
9
0.3
SE
9
0.6
S
6
1.2
S
5
1
S
7
0.9
S
7
0.7
SSE
8
0.8
SSE
8
clear
part cloud
part cloud
clear
part cloud
clear
part cloud
part cloud
part cloud
cloud
light rain
light rain
cloud
cloud
clear
part cloud
light rain
cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
part cloud
light rain
mod rain
heavy rain
cloud
cloud
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
cloud
cloud
light rain
part cloud
part cloud
part cloud
part cloud
clear
some clouds
some clouds
clear
some clouds
clear
some clouds
some clouds
some clouds
cloudy
light rain
light rain
cloudy
cloudy
clear
some clouds
light rain
cloudy
some clouds
some clouds
some clouds
clear
some clouds
some clouds
clear
clear
some clouds
some clouds
light rain
mod rain
heavy rain
cloudy
cloudy
clear
clear
some clouds
some clouds
clear
some clouds
some clouds
cloudy
cloudy
light rain
some clouds
some clouds
some clouds
some clouds
 km/h
25
WNW
10
NW
15
S
10
S
5
SSE
10
S
15
SSW
15
WSW
25
SSW
20
SSW
15
E
20
ENE
5
E
15
SW
25
SW
40
SW
20
NE
25
NE
30
NNE
25
NE
20
ESE
15
S
25
WSW
25
WSW
25
NE
25
ESE
30
SSE
40
SSE
50
SSW
25
SW
20
N
20
NW
15
W
30
NW
15
NW
20
SW
30
NNE
10
N
30
W
20
NE
15
SSE
25
S
40
S
30
WSW
25
WSW
20
N
20
ENE
 mm 
1
2
3
4
10
12
3
max°C
3
-2
-1
-1
-1
1
3
3
4
7
8
8
8
8
8
7
9
7
6
2
2
2
3
9
9
-1
1
10
11
9
10
4
3
3
-2
1
2
-2
2
2
0
4
7
7
7
8
2
Moonrise
6:35
6:57
7:21
7:48
8:21
9:01
9:52
10:54
12:04
1:19
2:33
3:44
4:52
5:59
7:04
Moonset
6:46
7:59
9:14
10:32
11:51
1:07
2:15
3:11
3:56
4:30
4:59
5:22
5:44
6:04
6:25
Sunrise
6:52
6:52
6:50
6:48
6:47
6:45
6:43
6:41
6:39
6:37
6:37
6:35
6:33
6:31
6:30
6:28
Sunset
6:53
6:54
6:55
6:57
6:58
7:00
7:00
7:01
7:02
7:04
7:05
7:06
7:07
7:07
7:08
7:09
Today's sea temperature in Block Island (Old Harbor) is
2.7° C
(Statistics for 17 Mar 1981-2005 – mean: 4.7 max: 6.5 min: 3.0°C)
Issued (local time): 7 pm Tuesday 17 Mar 2026
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest