Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island Surf Forecast and Surf Report

Issued: 7 pm 22 Aug 2026 (local time)

Forecast update in  hr  min

Today's Block Island sea temperature is
21.4°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 23 Aug 2026:

  • Most powerful swell: Saturday 29 Aug, 2PM (local time) - 3.5ft (1.1m), 7s period, S swell with 114 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 1.1m 7s and forecast to arrive on Saturday (Aug 29) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Wednesday (Aug 26) at 2AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Sat 29th Aug)3.5ft (1.1m) 7s

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


The Lowdown

Alright, plugging in the numbers for Block Island. Let’s see what we’ve got.

To be straight with you, the next couple of weeks are looking pretty grim. We’ve got a long stretch of small, messy, and mostly onshore wind slop. From Sunday the 23rd all the way through to the morning of Thursday the 4th of September, the surf is just poor. It’s small, it’s choppy, and the wind is all over the place. There’s nothing worth paddling out for in that first stretch. It’s a real bummer.

The first glimmer of something rideable shows up on the afternoon of Thursday the 4th of September. Block Island is a point break that rarely breaks, so when it does, you pay attention. That afternoon we’ve got a 4 ft swell rolling in from the ESE with a period of 8 seconds. The combined energy is moderate (232), and the wind is a gentle cross-offshore breeze, which will clean things up nicely. It’s not going to be huge, but the conditions will be about as good as they get in this window.

The morning of the 5th looks a bit blown out with a fresh breeze, even though it’s cross-off. The afternoon of the 6th has a bit more size – 5 ft from the S with an 11-second period and very strong energy (510) – but that E wind is going to put a cross-chop on it.

If you’re an expert and you’ve got your eye on the longer period groundswell, the morning of the 7th of September has 5 ft from the SE at 10 seconds, but again, that onshore breeze is going to be a problem.

Honestly, for this whole 16-day run, the standout is the afternoon of Thursday the 4th. It’s not a classic Block Island session, but it’s the cleanest and most promising window we’ve got. For everything else, you might as well stay home.

Rusty.

Short Range Forecast

Light rain (total 3mm), mostly falling on Sun morning. Warm (max 25°C on Sun night, min 20°C on Sat night). Mainly fresh winds.

Days 5-7 Weather Summary

Light rain (total 9mm), mostly falling on Fri morning. Warm (max 24°C on Fri afternoon, min 18°C on Tue night). Wind will be generally light.

Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
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
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
0.3
SE
8
0.3
SE
12
1.1
S
5
0.8
SSW
6
1
SSW
6
1
SW
5
0.3
SE
11
0.9
SW
4
0.9
SW
5
0.4
SE
9
0.6
SE
9
0.6
SE
8
0.6
SE
8
0.6
SE
9
0.6
SE
9
1.1
S
6
1.1
S
6
1
SSW
6
Wave Graph
Metric surfscale
Energy kJ
13
11
22
64
38
74
53
20
31
43
29
62
53
49
64
61
91
83
74
Wind (km/h)
10
E
10
ESE
25
SSW
15
WSW
20
WSW
25
SW
20
WNW
25
WSW
25
WSW
20
NW
15
WSW
25
SW
10
WSW
10
SSW
15
S
15
SSE
20
SE
10
SE
5
S
Wind State
cross
cross-on
cross-on
cross
cross
cross-on
cross-off
cross
cross
cross-off
cross
cross
cross-off
cross-on
cross-on
on
cross-on
on
cross-on
High Tide
5:21AM0.64m
5:53PM0.83m
6:12AM0.69m
6:36PM0.86m
6:56AM0.76m
7:13PM0.89m
7:35AM0.82m
7:47PM0.91m
8:10AM0.87m
8:18PM0.93m
8:43AM0.91m
8:50PM0.94m
Low Tide
11:34PM0.23m
11:15AM0.22m
00:18AM0.20m
12:06PM0.18m
00:57AM0.14m
12:50PM0.15m
1:31AM0.09m
1:30PM0.11m
2:02AM0.05m
2:08PM0.09m
2:30AM0.02m
2:43PM0.07m
2:55AM0.01m
part cloud
thunderstorm
clear
thunderstorm
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
light rain
thunderstorm
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:05
6:05
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:35
7:34
7:31
7:30
7:29
7:27
7:25
 mm
2
1
5
4
Temp °C
21
22
24
25
23
23
24
21
22
23
20
22
23
23
23
23
23
24
23
Feels °C
23
24
25
24
22
20
21
17
18
20
18
18
19
24
23
22
23
25
25
  • 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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