Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island Surf Forecast and Surf Report

Issued: 7 am 13 Sep 2026 (local time)

Forecast update in  hr  min

Today's Block Island sea temperature is
20.2°C
0.3° 

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 13 Sep 2026:

  • Most powerful swell: Sunday 20 Sep, 11AM (local time) - 6ft (1.8m), 6s period, SW swell with 239 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 1.8m 6s and forecast to arrive on Sunday (Sep 20) 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 1.0m 5s period and expected on Tuesday (Sep 15) at 8AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (Sun 20th Sep)6ft (1.8m) 6s

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


The Lowdown

Alright, let’s size this up for Block Island. To be honest, the next week plus is looking pretty flat, with the wind and swell refusing to play ball. It’s a long dry spell before anything decent happens, but there’s a flicker of something proper right at the tail end of the window.

The water is about 68°, which is a touch warmer than usual for this time. Not a huge deal, but you might get away with a slightly thinner suit.

Starting Sunday the 13th, it’s tiny. We’re talking a 1ft swell from the SE with a period of 10 seconds and weak energy (51), plus rain and onshore wind. It’s a total washout. Monday and Tuesday are cleaner with some offshore breeze, but the swell is still tiny and weak - about 1ft to 2ft. Not worth paddling out for.

Wednesday the 16th through Friday the 19th is a real downer. The swell swings East with periods under 8 seconds, weak energy mostly under 100, and the wind is cross-onshore the whole time, chopping everything up. The combined energy is pathetic, sitting between 21 and 62. Just leave the board in the truck.

Saturday the 20th brings a shift. The swell jumps up to 6ft from the SW, with moderate energy (297). Problem is, that’s a short-period windswell (6 seconds) and the wind is a strong cross-onshore. It’ll be a messy, blown-out mess. You might want to rig a kite instead of a paddle board that day.

Then we hit another quiet stretch. From Sunday the 21st through Thursday the 24th, the swell drops right back down. There's some clean morning wind here and there, but with waves barely hitting 2ft and energy under 100, there’s nothing to ride.

The real standout is the last weekend, starting Friday the 25th. We get a solid 5ft to 7ft ESE groundswell rolling in. The combined energy goes from 313 up to a punchy 1400 on Saturday the 26th morning. That’s some proper, moderate-to-strong wave energy. The swell period is 8 to 10 seconds, giving it some grunt, and the wind is a fresh offshore from the NE. That’ll clean it up nicely. This is solidly in the intermediate to expert range, so it might be a bit much for beginners. With crowds listed as ‘often’, expect to share the lineup.

That Saturday the 26th morning session is the one. A solid 7ft swell, 10-second period, and clean offshore wind. It’s a pumping day at the Point, though it’s a long way out - promising, but you gotta keep an eye on it.

Short and sweet for the second week: After the 20th, the first real wave is the 25th-27th. The 28th drops off quick.

So, to wrap it up: There's a whole lot of nothing for nearly two weeks, but that final Saturday the 26th morning at Block Island Point has some real promise. It's clean and has some size. Circle that date.

Rusty

Short Range Forecast

Heavy rain (total 40mm), heaviest during Sun afternoon. Warm (max 23°C on Mon afternoon, min 14°C on Tue morning). Winds decreasing (fresh winds from the NNE on Mon night, calm by Tue night).

Days 4-6 Weather Summary

Light rain (total 4mm), mostly falling on Thu night. Warm (max 21°C on Thu afternoon, min 16°C on Wed morning). Winds increasing (light winds from the SSW on Wed morning, fresh winds from the NE by Fri morning).

Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
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)
0.4
SE
10
0.9
S
5
0.4
SE
9
0.4
SE
9
0.5
SE
8
0.4
SE
8
0.3
SE
9
0.6
E
5
0.5
E
5
0.3
E
7
0.5
E
8
0.6
ESE
8
0.6
E
8
0.5
E
7
0.4
E
7
0.3
SE
12
0.3
SE
12
0.7
E
6
0.7
ESE
7
0.6
ESE
7
0.6
ESE
7
Wave Graph
Metric surfscale
Energy kJ
33
43
29
27
35
18
13
16
13
9
29
49
42
26
14
23
22
38
49
42
41
Wind (km/h)
20
S
10
N
20
SW
30
NNW
20
N
25
NNE
20
ENE
10
SE
5
S
15
SSW
20
SW
20
SW
25
SW
25
SW
25
NE
30
NE
30
ENE
15
NE
15
ESE
15
SE
15
S
Wind State
on
cross-off
cross
off
off
cross-off
cross
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross-off
cross-off
cross
cross-off
cross-on
on
cross-on
High Tide
9:59AM1.06m
10:14PM0.87m
10:41AM1.01m
10:54PM0.80m
11:24AM0.95m
11:35PM0.73m
12:09PM0.88m
00:20AM0.66m
1:03PM0.82m
1:13AM0.61m
2:11PM0.77m
2:30AM0.59m
3:24PM0.75m
3:49AM0.61m
Low Tide
4:16PM0.04m
3:55AM0.06m
4:59PM0.09m
4:21AM0.11m
5:46PM0.16m
4:52AM0.16m
6:44PM0.22m
5:32AM0.20m
7:58PM0.27m
6:24AM0.25m
9:08PM0.29m
7:41AM0.28m
10:08PM0.27m
mod rain
rain showers
rain showers
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
light rain
part cloud
clear
clear
part cloud
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:24
6:24
6:26
6:26
6:28
6:28
6:30
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:59
6:58
6:55
6:53
6:52
6:51
6:49
 mm
8
31
1
4
Temp °C
22
21
22
19
23
20
15
16
16
16
18
19
20
21
21
18
20
18
18
18
18
Feels °C
22
21
22
15
19
15
11
14
15
16
16
17
18
18
20
14
16
12
16
16
14
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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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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