Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island 48 hour detailed Surf Forecast

Issued: 7 pm 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Block Island sea temperature is
21.8° C
0.1° 

Block Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


How big are the waves at Block Island today (17 Aug):

  • Afternoon surf: Afternoon surf (17 Aug, local time) - 4ft (1.2m), 6s period with S swell.
  • Evening surf: Evening surf (17 Aug, local time) - 4ft (1.2m), 6s period with S swell.

The current surf forecast for Block Island at 10PM is: 1.1m 6s primary swell from a South direction and 0.1m 9s secondary swell from a Southeast direction (forecast issued at 07:00pm August 17). An open ocean swell of 0.5m 3s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (EDT) & DateWave HeightWave Period
Morning (17 Aug)--
Afternoon (17 Aug)4ft (1.2m)6s
Evening (17 Aug)4ft (1.2m)6s

Table - waves today at Block Island. (Swell directed towards the surf break)


Short Range Forecast

Mostly dry. Warm (max 26°C on Wed afternoon, min 20°C on Mon night). Wind will be generally light.

Mon
17
Tuesday
18
Wednesday
19
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
S
6
1.3
SSE
6
1.1
S
6
1
S
6
0.9
S
6
0.9
S
7
1
S
7
1.1
SSE
8
0.9
SSE
8
0.7
S
7
0.6
SE
8
0.7
SE
8
0.7
SE
8
0.7
SE
8
0.7
SE
7
0.6
SE
7
0.6
SSE
6
0.4
ESE
8
0.5
SE
8
Wave Graph
Metric surfscale
Energy kJ
127
134
92
79
64
74
112
131
102
53
42
63
61
57
51
43
27
22
28
Wind (km/h)
30
ENE
20
NE
20
NNE
20
NNE
15
NNE
15
NNE
5
NNE
15
WSW
15
SW
15
SSW
15
SW
10
WSW
10
WSW
5
WNW
10
SSW
15
SW
20
SSW
20
SW
15
WSW
Wind State
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross-on
cross-on
cross
cross
glassy
cross-on
cross
cross-on
cross-on
cross
High Tide
00:13AM0.76m
12:54PM0.90m
1:02AM0.69m
1:51PM0.84m
Low Tide
6:30PM0.15m
5:54AM0.13m
7:31PM0.20m
6:30AM0.19m
8:37PM0.25m
part cloud
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
5:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:42
7:40
7:39
 mm
Temp °C
21
21
21
21
20
20
22
23
24
24
24
24
24
24
24
25
26
25
25
Feels °C
20
21
21
21
20
20
24
24
25
25
25
26
26
26
25
25
25
24
25
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
How to use the Wavefinder 

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Block Island surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


Nearest locationNearest