Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island Surf Forecast and Surf Report

Issued: 7 am 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Block Island sea temperature is
21.2° 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 19 Aug 2026:

  • Most powerful swell: Saturday 22 Aug, 11AM (local time) - 5ft (1.5m), 6s period, S swell with 160 kJ wave energy.

Best Forecast Surf Conditions for Block Island this week:

The most powerful waves expected at Block Island in the next 16 days are 1.5m 6s and forecast to arrive on Saturday (Aug 22) at 11AM. 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 8PM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (Sat 22nd Aug)5ft (1.5m) 6s

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


The Lowdown

Alright, Rusty here. Let’s take a look at what’s on offer for Block Island.

Honestly, right now, it’s a pretty flat spell. The first few days are looking like a total write-off for any decent waves. We’ve got a long stretch of tiny, weak, and messy surf from the 19th right through to the 26th of August. The swell is barely a shadow of itself, mostly around 1 ft to 2 ft, with short periods under 8 seconds, and the combined energy is weak, sitting in the doldrums (between 21 and 83). The winds are all over the place, mostly cross or onshore, leaving the surface choppy or just flat. It's a real bust for paddle surfing.

The one standout in this whole forecast comes later, around the 27th of August: a Thursday morning with a pulse of energy. We’ll see a 6 ft swell from the south, with a period of 7 seconds. The combined energy kicks up to a moderate 472, which is the strongest we’ll see. But here’s the catch—the wind is a strong 25 mph from the SSW, blowing cross-onshore, making it a messy, strong cross-onshore and messy scene. The setup at Block Island is a point break, but with that much wind and a short-period swell, it’s going to be a battle. Honestly, that setup looks more interesting for kite surfing than paddle surfing. Not the day for a clean line.

The 28th of August Friday morning shows a similar 6 ft swell from the SSW, but the wind is a fresh 19 mph from the WSW, blowing cross-shore with a lumpy cross-chop. The energy is strong at 409, but again, it’s rough. The water temp is about 70°, which is 0.9° cooler than average for this time of year, so pretty normal for August.

The week after that, from the 29th of August to the 3rd of September, we see things drop back down. The swell sizes are back to 2 ft to 4 ft, with moderate energy levels (between 70 and 235). The winds are a bit better, with some clean, cross-off conditions on the 29th and 2nd of September, but the swell is just too small and weak to get excited about. The 1st of September Tuesday morning has a 3 ft swell with a 12-second period, but the wind is a fresh 22 mph cross-onshore, so it’s lumpy again.

So, for the best bet, if you’re desperate, aim for the 29th of August Saturday morning. It’s not a standout by any means, but it’s the cleanest we get. The swell is 3 ft from the SE, period 8 seconds, with a moderate combined energy of 147. The wind is a fresh 19 mph from the west, blowing cross-offshore, keeping the surface clean. The break is Block Island, a point, and it’s a rare-breaking spot. It’s intermediate-level, and crowds are often a thing here. It’s not a day for beginners, but for a local who knows the lineup, it’s the only window with a chance at a clean, rideable wave.

Rusty.

Short Range Forecast

Light rain (total 7mm), mostly falling on Fri night. Warm (max 26°C on Thu afternoon, min 20°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 45mm), heaviest during Sat afternoon. Warm (max 25°C on Mon afternoon, min 17°C on Sat night). Wind will be generally light.

Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
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
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)
0.6
SE
7
0.6
SSE
6
0.5
SE
9
0.4
ESE
7
0.4
SE
7
0.4
SE
8
0.4
SE
8
0.4
ESE
8
0.8
SSE
5
1.5
S
6
1.1
S
5
0.6
SE
6
0.5
SE
5
0.3
SE
12
0.8
SSE
6
0.4
SE
12
0.4
SE
11
0.3
SE
11
0.3
SE
11
0.4
SE
10
0.3
SE
10
Wave Graph
Metric surfscale
Energy kJ
41
24
38
20
12
18
18
26
36
160
69
26
14
22
45
35
32
23
18
27
17
Wind (km/h)
15
SW
20
SSW
15
SW
5
W
20
WNW
10
NW
15
ENE
15
ESE
20
ESE
20
SE
10
NW
15
N
5
ESE
10
SSW
15
W
15
NW
20
WSW
20
N
15
ENE
10
S
10
SSE
Wind State
cross
cross-on
cross
glassy
cross-off
cross-off
cross
cross-on
cross-on
cross-on
off
off
cross-on
cross-on
cross-off
cross-off
cross
cross-off
cross
on
on
High Tide
1:51PM0.84m
1:59AM0.63m
2:56PM0.80m
3:09AM0.60m
4:02PM0.79m
4:20AM0.60m
5:03PM0.80m
5:21AM0.64m
5:53PM0.83m
6:12AM0.69m
6:36PM0.86m
6:56AM0.76m
7:13PM0.89m
Low Tide
8:37PM0.25m
7:19AM0.23m
9:43PM0.27m
8:42AM0.25m
10:43PM0.26m
10:14AM0.24m
11:34PM0.23m
11:15AM0.22m
00:18AM0.20m
12:06PM0.18m
00:57AM0.14m
12:50PM0.15m
1:31AM0.09m
part cloud
clear
clear
part cloud
cloud
clear
clear
part cloud
mod rain
heavy rain
rain showers
cloud
cloud
part cloud
rain showers
clear
clear
part cloud
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
6:00
6:01
6:01
6:03
6:03
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:39
7:37
7:37
7:35
7:34
7:31
7:30
 mm
7
21
23
1
Temp °C
24
25
25
24
26
24
21
23
23
21
21
20
18
21
23
22
25
25
19
21
21
Feels °C
25
24
26
25
24
23
18
21
21
22
22
20
19
23
24
20
22
23
17
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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