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 08:19 PM.

Days 1–4 Weather Summary

Mostly dry. Warm air temperatures (max 22°C on Mon afternoon, min 18°C on Fri night). Wind will be generally light.

Days 5–7 Weather Summary

Light rain (total 7mm), mostly falling on Wed night. Warm air temperatures (max 25°C on Tue afternoon, min 23°C on Mon night). Mainly fresh winds.

Days 8–10 Weather Summary

Heavy rain (total 24mm), heaviest during Sat night. Warm (max 27°C on Thu night, min 22°C on Sat night). Winds increasing (light winds from the SW on Sat morning, fresh winds from the WSW by Sat night).

Days 11–13 Weather Summary

Mostly dry. Warm (max 26°C on Tue morning, min 21°C on Mon morning). Wind will be generally light.

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
Wed
23
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
Wave Height Map
High Tide
8:57PM1.04m
9:18AM0.87m
9:38PM1.04m
10:03AM0.91m
10:21PM1.02m
10:50AM0.94m
11:07PM0.99m
11:39AM0.97m
11:55PM0.95m
12:29PM1.00m
00:46AM0.90m
1:22PM1.02m
1:42AM0.85m
2:19PM1.03m
2:44AM0.81m
3:22PM1.05m
3:52AM0.80m
4:31PM1.06m
5:03AM0.82m
5:38PM1.10m
6:06AM0.86m
6:38PM1.13m
7:03AM0.92m
Low Tide
3:33AM0.05m
3:03PM0.05m
4:03AM0.03m
3:47PM0.06m
4:34AM0.02m
4:33PM0.08m
5:08AM0.01m
5:25PM0.11m
5:48AM0.01m
6:28PM0.14m
6:34AM0.02m
7:52PM0.15m
7:28AM0.03m
9:18PM0.14m
8:28AM0.04m
10:29PM0.12m
9:34AM0.05m
11:33PM0.08m
10:44AM0.04m
00:31AM0.04m
11:52AM0.02m
1:25AM0.01m
12:55PM-0.01m
Wave
height (m) 
direction
period (s) 
0.7
S
8.0
0.6
S
7.0
0.6
S
7.0
0.7
S
8.0
0.6
S
7.0
0.5
S
7.0
0.5
SSE
6.0
0.5
SE
6.0
0.6
ESE
7.0
0.5
SE
6.0
0.4
SE
6.0
0.5
S
3.0
0.4
SSE
5.0
0.5
S
3.0
0.6
S
4.0
0.9
S
6.0
0.8
S
6.0
0.8
S
7.0
0.7
S
7.0
0.6
S
7.0
0.6
S
7.0
0.6
S
7.0
0.5
S
6.0
0.7
S
4.0
0.8
S
6.0
0.7
S
7.0
0.7
S
7.0
0.6
S
7.0
0.6
S
7.0
0.5
S
7.0
0.6
S
7.0
0.6
S
8.0
0.6
S
7.0
0.5
S
7.0
0.4
SSE
6.0
0.4
SSE
6.0
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
thunderstorm
clear
rain showers
rain showers
clear
thunderstorm
part cloud
part cloud
rain showers
clear
clear
rain showers
light rain
part cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
some clouds
some clouds
some clouds
clear
clear
clear
clear
clear
some clouds
clear
clear
clear
clear
risk tstorm
clear
rain shwrs
rain shwrs
clear
risk tstorm
some clouds
some clouds
rain shwrs
clear
clear
rain shwrs
light rain
some clouds
clear
clear
clear
clear
some clouds
clear
clear
clear
clear
 km/h
10
SE
15
E
15
ESE
15
ESE
15
ESE
15
SE
15
SSE
15
SSW
20
SSW
15
SW
20
SW
25
SSW
20
SW
25
SSW
25
SSW
25
SSW
20
WSW
20
SW
10
NW
15
ENE
10
SSE
15
SSW
20
SW
25
SSW
15
WSW
15
W
10
SW
5
SSW
5
E
15
SSW
20
W
10
W
15
SSW
10
SSW
10
SSE
20
SSW
 mm 
1
4
2
1
7
12
4
max°C
20
19
19
19
20
21
21
21
22
23
24
25
25
25
24
24
24
25
27
23
24
25
25
25
24
23
25
24
22
24
24
26
26
26
24
24
Moonrise
9:22
9:52
10:18
10:42
11:04
11:26
11:51
12:20
12:55
1:40
2:37
3:44
Moonset
5:45
6:56
8:08
9:19
10:30
11:41
12:54
2:09
3:27
4:45
5:58
7:01
7:52
Sunrise
5:22
5:24
5:24
5:26
5:26
5:26
5:28
5:28
5:30
5:31
5:31
5:31
Sunset
8:19
8:19
8:17
8:17
8:16
8:16
8:15
8:15
8:15
8:14
8:13
8:12
8:12
Today's sea temperature in Block Island (Old Harbor) is 20.7 °C (Statistics for 11 Jul 1981-2005 – mean: 20.5 max: 22.5 min: 18.7°C)
Issued (local time): 7 pm Friday 11 Jul 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest