Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island Surf Forecast and Surf Report

Issued: 7 pm 11 Aug 2026 (local time)

Forecast update in  hr  min

Today's Block Island sea temperature is
21.9° 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 12 Aug 2026:

  • Best quality surf: Monday 17 Aug, 11AM (local time) - 5ft (1.6m), 8s period, SSW swell with offshore winds.
  • Most powerful swell: Monday 17 Aug, 5AM (local time) - 7ft (2.2m), 8s period, SSW swell with 572 kJ wave energy.
  • Next surfable swell (1★+): Monday 17 Aug, 11AM (local time) - 5ft (1.6m), 8s period with SSW 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 11AM. The primary swell is predicted to be 1.6m and 8s period. 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 2.2m 8s and forecast to arrive on Monday (Aug 17) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Saturday (Aug 15) at 8AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)11AM (Mon 17th Aug)5ft (1.6m) 8s
Best Surf11AM (Mon 17th Aug)5ft (1.6m) 8s
Most Powerful 5AM (Mon 17th Aug)7ft (2.2m) 8s

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


The Lowdown

Alright, Rusty here. Let's get into it.

First up, we're looking at Block Island. This spot is a point break that rarely breaks and when it does, it's an intermediate level wave. The crowds can be a factor here, as they are "often" around. For the next week, it's a pretty grim picture. We've got a long run of days from now through to the 16th of August with nothing surfable. Small, weak, and messy conditions dominate with combined swell energy figures in the low teens to around 100 (between 21 and 104). The winds are mostly cross or cross-onshore, creating choppy, poor quality surf. It's not looking good at all. There is a glimmer of hope on the horizon.

The standout window opens up on Monday the 17th of August. The morning sees a NNW offshore wind at 9 mph, which is a major positive. We've got a 5 ft SSW groundswell with an 8-second period, and the combined energy jumps to a moderate 303. This is the best call of the whole outlook. The afternoon holds up with a 4 ft SSW swell, and while it's cross-offshore, it remains clean. This is biggest and best-conditioned surf we’ll see.

After that small burst, it drops off again. Tuesday the 18th morning has glassy 2 ft waves but with a tiny combined energy of just 70 – barely a ripple. Then we head into a long, extended run of poor conditions. From the 18th through to the 27th, the story is the same: small swells, mostly onshore winds, and combined energy figures that rarely get above 100, the exceptions being some moderate energy in the 100-200 range but with poor winds. The 22nd has some bigger 7 ft swell, but it's a messy cross-onshore wind, making it a write-off. A few days in the second week offer glassy conditions on the 25th and 26th afternoons, but with swells of only 1 ft to 2 ft and combined energy in the 40s, there's just no power. This area goes through blank runs like this, it's normal.

So, for my money, the only window worth paddling out for is the Monday the 17th of August. Lock it in.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Tue night, min 20°C on Thu morning). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 9mm), mostly falling on Fri night. Warm (max 26°C on Mon afternoon, min 17°C on Fri night). Winds increasing (calm on Sat afternoon, near gales from the SW by Sun night).

Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
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
0
0
0
0
0
0
0
0
0
0
2
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SW
6
0.5
SSW
5
0.4
SSW
5
0.4
SSW
6
0.6
SW
4
0.6
SSW
6
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.4
S
6
0.4
S
6
0.4
S
6
0.5
S
7
0.5
S
7
1.5
SSW
5
2.3
SSW
7
1.6
SSW
8
1.3
SSW
8
0.9
SSW
7
Wave Graph
Metric surfscale
Energy kJ
25
15
10
12
16
20
13
13
15
12
12
11
23
24
104
565
303
176
79
Wind (km/h)
10
NW
10
ENE
15
SSW
10
WNW
5
ENE
10
WSW
10
NW
15
ENE
15
S
20
NNE
20
NNE
15
SSW
25
WSW
25
SSW
40
SSW
40
W
15
NNW
15
W
25
N
Wind State
off
cross
cross-on
cross-off
cross
cross
off
cross
on
cross-off
cross-off
cross-on
cross
cross-on
cross-on
cross-off
off
cross-off
cross-off
High Tide
8:02AM0.97m
8:27PM1.09m
8:53AM1.03m
9:14PM1.05m
9:42AM1.05m
9:59PM0.99m
10:29AM1.05m
10:44PM0.92m
11:16AM1.01m
11:28PM0.84m
12:04PM0.96m
00:13AM0.76m
Low Tide
2:13AM-0.03m
2:05PM-0.06m
2:57AM-0.05m
3:00PM-0.05m
3:38AM-0.05m
3:53PM-0.02m
4:17AM-0.03m
4:44PM0.02m
4:52AM0.02m
5:35PM0.08m
5:24AM0.07m
6:30PM0.15m
part cloud
clear
clear
part cloud
part cloud
part cloud
clear
clear
cloud
rain showers
clear
part cloud
clear
part cloud
part cloud
rain showers
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:52
5:52
5:54
5:54
5:56
5:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:51
7:49
7:47
7:46
7:45
7:44
7:42
 mm
4
5
Temp °C
26
23
25
25
21
22
25
22
24
18
20
22
22
23
23
24
23
26
26
Feels °C
25
23
23
23
22
23
24
21
22
15
16
21
19
20
19
18
23
25
24
  • 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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