Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island Surf Forecast and Surf Report

Issued: 7 pm 15 Aug 2026 (local time)

Forecast update in  hr  min

Today's Block Island sea temperature is
21.5° C
0.5° 

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


Block Island surf forecast from 16 Aug 2026:

  • Best quality surf: Tuesday 18 Aug, 2AM (local time) - 4ft (1.2m), 8s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Tuesday 18 Aug, 8AM (local time) - 4.5ft (1.3m), 8s period, S swell with 196 kJ wave energy.
  • Next surfable swell (1★+): Monday 17 Aug, 11PM (local time) - 3.5ft (1.1m), 7s period with SSE swell.

Best Forecast Surf Conditions for Block Island this week:

The surf forecast for Block Island over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 11PM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.7m and 7s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Block Island in the next 16 days are 1.3m 8s and forecast to arrive on Tuesday (Aug 18) at 8AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Friday (Aug 21) at 8PM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)11PM (Mon 17th Aug)3.5ft (1.1m) 7s
Best Surf 2AM (Tue 18th Aug)4ft (1.2m) 8s
Most Powerful 8AM (Tue 18th Aug)4.5ft (1.3m) 8s

Table - best surf conditions forecast for Block Island over the next 16 days.


The Lowdown

Right, let’s take a look at what we’ve got coming up for Block Island over the next couple of weeks. I gotta say, it’s a pretty bleak run of surf for a while. The swell is small and the wind is in the wrong spot most of the time, so the first real window where we can get into the water is on the morning of Tuesday the 18th. Before that, we’re looking at Sunday and Monday with nothing worth paddling out for—real poor conditions and tiny, weak waves.

Come Tuesday morning the 18th, the swell is just sneaking in at about 4ft from the south with a period of 7 seconds. The combined energy is moderate at 187, so it’s not a powerhouse, but the wind is light from the NNE, which is cross-offshore and keeping the surface clean. The water temperature is about average for this time of year, nothing unusual. It’s just surfable, not something to write home about.

The rest of that week, from Tuesday afternoon right through to the following Sunday the 23rd, it’s a real struggle. The swell drops right off, the wind gets messy, and the wave height is often under 2ft. The water goes glassy on the morning of Sunday the 23rd, but with only 1ft and a combined energy of 22, it’s barely a ripple. Another glassy moment on Monday the 24th with 2ft, but again, wind picks up in the afternoon and kills it.

Now, moving into the second week, things start to change. On Thursday the 27th, we finally get a real standout. The morning brings a 2ft swell from the SE with a long period of 12 seconds, and a combined energy of 212—moderate, but the quality is there. The wind is light WNW, cross-offshore, and the conditions are clean. By the afternoon, the swell bumps up to 3ft from the same direction, period still at 12 seconds, and a bigger combined energy of 224. The wind swings to the north at 12 mph, straight offshore, and it stays clean. This is the best on offer for the whole outlook. With a period over 11 seconds, this is a true groundswell, and at Block Island, a point break, it should set up nicely. Just a heads up, this spot rarely breaks, so the fact it’s showing potential is worth noting. Also, crowds are often here, so expect company if you make the call.

After that, the surf holds into Friday the 28th but drops in quality, and the winds get tricky again. The rest of the forecast fades into small, weak swell with onshore winds. The last bit on Monday the 31st shows a bump to 6ft from the east with a period of 7 seconds and a combined energy of 377, but it’s cross-onshore and choppy, so it’s really for the dedicated only.

So, if you’re hanging for a wave, pencil in Thursday the 27th as the day to be on Block Island. It’s not huge, but it’s clean and has that proper pulse.

Stay stoked.
Rusty

Short Range Forecast

Light rain (total 4mm), mostly falling on Mon morning. Warm (max 23°C on Sat night, min 20°C on Sun morning). Winds increasing (light winds from the S on Sun morning, fresh winds from the S by Sun night).

Days 5-7 Weather Summary

Light rain (total 2mm), mostly falling on Thu morning. Warm (max 25°C on Wed afternoon, min 19°C on Fri morning). Wind will be generally light.

Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
2
1
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)
0.2
ESE
9
0.3
SE
9
0.6
S
6
0.9
S
4
1.3
S
5
1.2
S
6
1.2
SSE
8
1.1
S
7
1
S
7
0.6
SE
6
0.6
SE
7
0.6
SE
6
0.5
SE
6
0.5
SE
9
0.4
SE
8
0.6
E
5
1
E
4
0.4
SE
8
0.1
SE
14
Wave Graph
Metric surfscale
Energy kJ
8
12
25
28
97
92
169
124
94
32
34
26
17
37
18
19
35
16
7
Wind (km/h)
10
SSW
5
S
25
SSW
25
SSW
35
SSE
10
SE
15
N
10
NNE
15
S
20
SW
15
SW
20
SW
10
W
20
NNE
20
ENE
10
NNE
15
ENE
10
SE
15
E
Wind State
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-off
cross-off
cross-on
cross-on
cross-on
cross-on
cross-off
cross-off
cross
cross-off
cross
cross-on
cross-on
High Tide
10:44PM0.92m
11:16AM1.01m
11:28PM0.84m
12:04PM0.96m
00:13AM0.76m
12:54PM0.90m
1:02AM0.69m
1:51PM0.84m
1:59AM0.63m
2:56PM0.80m
3:09AM0.60m
4:02PM0.79m
4:20AM0.60m
Low Tide
4:52AM0.02m
5:35PM0.08m
5:24AM0.07m
6:30PM0.15m
5:54AM0.13m
7:31PM0.20m
6:30AM0.19m
8:37PM0.25m
7:19AM0.23m
9:43PM0.27m
8:42AM0.25m
10:43PM0.26m
clear
clear
part cloud
part cloud
light rain
thunderstorm
clear
part cloud
clear
part cloud
clear
clear
part cloud
light rain
rain showers
clear
part cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:56
5:56
5:58
5:58
6:00
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:45
7:44
7:42
7:40
7:39
7:37
7:37
 mm
3
1
1
1
Temp °C
23
21
23
23
21
23
23
22
23
24
24
25
25
23
21
21
20
21
21
Feels °C
21
20
20
20
20
23
25
23
24
24
25
25
23
24
19
21
19
20
20
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Block Island Surf forecast

The above surf forecast table for Block Island provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Block Island can be found by selecting the local surf guide option on the grey menu. Our Block Island surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Block Island) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Block Island may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Block Island is 33 km (20 miles) from Westerly. If you plan a vacation in Rhode Island, look for hotels and other accommodation in Westerly. Westerly has rooms for a wide range of budgets as well as car hire and transport links.

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