Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island 48 hour detailed Surf Forecast

Issued: 7 pm 16 Aug 2026 (local time)

Forecast update in  hr  min

Today's Block Island sea temperature is
22.0° 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):

  • Morning surf: Morning surf (17 Aug, local time) - 4.5ft (1.4m), 5s period with S swell.
  • Afternoon surf: Afternoon surf (17 Aug, local time) - 4ft (1.2m), 6s period with SSW swell.
  • Evening surf: Evening surf (17 Aug, local time) - 5ft (1.5m), 7s period with S swell.

The current surf forecast for Block Island at 2AM is: 0.9m 4s primary swell from a South-southwest direction and 0.3m 8s secondary swell from a Southeast direction (forecast issued at 07:00pm August 16). The wind direction is predicted to be cross-onshore.

Time (EDT) & DateWave HeightWave Period
Morning (17 Aug)4.5ft (1.4m)5s
Afternoon (17 Aug)4ft (1.2m)6s
Evening (17 Aug)5ft (1.5m)7s

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


Short Range Forecast

Moderate rain (total 12mm), heaviest on Mon afternoon. Warm (max 25°C on Wed afternoon, min 21°C on Sun night). Winds decreasing (fresh winds from the SSE on Mon afternoon, calm by Tue afternoon).

Sun
16
Monday
17
Tuesday
18
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
1
1
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)
0.5
S
6
0.6
S
6
0.7
SSW
4
0.9
SSW
4
1
S
4
1.3
S
5
1.5
S
6
1.2
SSW
6
1.8
S
7
1.6
S
7
1.4
S
7
1.2
S
7
1
S
7
1.1
S
7
1
S
7
0.8
S
7
0.8
S
7
0.8
SE
8
0.8
SE
8
Wave Graph
Metric surfscale
Energy kJ
18
25
13
28
40
90
149
109
285
219
168
134
89
114
103
64
68
78
77
Wind (km/h)
25
SSW
25
SSW
25
SSW
30
SSW
35
S
30
SSE
35
SSE
35
SSE
20
SSE
10
SE
10
NNE
20
NNE
15
N
15
NNW
15
N
5
NNE
5
ESE
10
SSE
10
ESE
Wind State
cross-on
cross-on
cross-on
cross-on
on
on
on
on
on
cross-on
cross-off
cross-off
cross-off
off
off
glassy
cross-on
on
cross-on
High Tide
11:28PM0.84m
12:04PM0.96m
00:13AM0.76m
12:54PM0.90m
Low Tide
5:35PM0.08m
5:24AM0.07m
6:30PM0.15m
5:54AM0.13m
7:31PM0.20m
clear
part cloud
cloud
light rain
light rain
light rain
light rain
light rain
thunderstorm
part cloud
part cloud
cloud
cloud
cloud
cloud
cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:56
5:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:44
7:42
7:40
 mm
1
3
1
2
4
1
Temp °C
23
23
22
21
21
22
22
22
23
23
23
22
21
21
22
23
23
24
22
Feels °C
20
20
19
18
17
19
20
20
24
26
26
23
22
22
23
26
26
26
23
  • 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.


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