Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island Surf Forecast and Surf Report

Issued: 1 am 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.


Block Island surf forecast from 16 Aug 2026:

  • Best quality surf: Monday 17 Aug, 11PM (local time) - 4.5ft (1.3m), 7s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Monday 17 Aug, 8PM (local time) - 5ft (1.6m), 6s period, SSE swell with 212 kJ wave energy.
  • Next surfable swell (1★+): Monday 17 Aug, 11PM (local time) - 4.5ft (1.3m), 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 1.3m and 7s period with a secondary swell of 0.6m and 6s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Block Island in the next 16 days are 1.6m 6s and forecast to arrive on Monday (Aug 17) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Thursday (Aug 20) at 2PM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)11PM (Mon 17th Aug)4.5ft (1.3m) 7s
Best Surf11PM (Mon 17th Aug)4.5ft (1.3m) 7s
Most Powerful 8PM (Mon 17th Aug)5ft (1.6m) 6s

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


The Lowdown

Alright, I’m looking at the next 16 days here, and I gotta be straight with you – it’s a tough stretch for Block Island. This spot is a point break that rarely breaks, and unfortunately, the next couple of weeks are living up to that reputation. The water temp is sitting at 72°, which is bang on average for this time of year, so at least the water’s nice if you’re just floating.

We’re starting off now, and for the first week, it’s pretty much a write-off. The swell is tiny, with heights barely scraping 2 ft, and the energy is weak – you’re looking at readings in the teens and twenties (19-53). The winds are mostly cross or onshore, and the guidance is calling it “poor surf conditions” every single day. There’s a glimmer of hope on the morning of Tuesday, August 18th, with a bit of clean cross-off wind and some 3 ft swell from the SE, period around 8 seconds, and energy hitting 171 – but it’s still considered “surfable but very ordinary.” Not exactly a call to action.

Then it gets worse. From the 19th through the 24th, we’re in a proper flat spell. Swell drops to 0.7 ft to 1 ft, energy is in the gutter (22-54), and the winds are all over the place. Even a glassy period on the afternoon of August 20th can’t save it – there’s just no wave to work with.

The second week shows a bit of a pulse, but it’s not for the faint-hearted. Around Tuesday, August 25th, the swell bumps up to 6 ft from the SSW, with a short, weak period of 6 seconds and energy jumping to 242. But the wind is a moderate cross-onshore, and the conditions are still described as “poor.” That’s a lot of lumpy, choppy water for not much reward. August 26th sees a drop in size to 3 ft and cleaner offshore wind from the NW, but it’s still a far cry from good.

August 27th brings a long-period groundswell from the SE, period hitting 12 seconds and energy at 114, but the swell is only 2 ft. That long period would look great at a point, but there’s no power behind it. August 31st has a little more size – 3 ft to 4 ft from the SW, period still short at 6 seconds, energy up to 183, but the wind is onshore or cross-shore.

Honestly, mate, there’s no standout session here. The best you could hope for is the morning of Tuesday, August 18th, for a tiny, clean wave that’s barely surfable. Everything else is a flat, blown-out, or weak mess. If you’ve got a kite, August 25th might be more interesting for you than a paddle.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Mon morning. Warm (max 23°C on Sun afternoon, min 20°C on Sun morning). Winds increasing (light winds from the ESE on Sun morning, fresh winds from the SSW by Sun night).

Days 4-6 Weather Summary

Heavy rain (total 27mm), heaviest during Fri afternoon. Warm (max 25°C on Wed afternoon, min 17°C on Fri afternoon). Wind will be generally light.

Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
AM
PM
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
1
1
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)
0.3
SE
9
0.5
S
6
0.8
SSW
4
1.4
S
6
1.1
SSW
6
1.3
SSE
7
0.9
SE
8
1
SE
8
0.7
SE
8
0.5
SE
8
0.5
SE
6
0.5
SE
9
0.3
SE
9
0.4
SE
9
0.4
SE
9
0.4
SE
8
0.4
SE
8
0.5
SE
8
0.4
ESE
8
0.4
ESE
7
0.4
ESE
7
Wave Graph
Metric surfscale
Energy kJ
12
18
19
116
87
142
109
125
63
28
17
38
12
27
26
18
18
32
19
21
18
Wind (km/h)
5
ESE
20
SSW
30
SSW
30
SE
20
SE
15
NNE
10
NE
10
S
10
S
10
WSW
20
SW
5
W
25
N
0
SSE
5
WNW
15
NE
20
NE
25
NE
20
NE
10
SSE
10
SSW
Wind State
cross-on
cross-on
cross-on
on
cross-on
cross-off
cross-off
on
on
cross
cross-on
glassy
off
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
on
cross-on
High Tide
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
5:03PM0.80m
Low Tide
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
10:14AM0.24m
11:34PM0.23m
clear
part cloud
part cloud
light rain
rain showers
part cloud
part cloud
part cloud
clear
clear
clear
clear
rain showers
rain showers
clear
part cloud
heavy rain
mod rain
part cloud
part 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
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:44
7:42
7:40
7:39
7:37
7:37
7:35
 mm
4
1
1
1
16
9
Temp °C
22
23
23
21
23
23
22
23
23
24
25
25
21
20
21
20
17
19
19
20
21
Feels °C
23
20
21
19
24
26
24
25
25
26
25
23
19
22
22
18
17
17
18
21
22
  • 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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