Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island Surf Forecast and Surf Report

Issued: 7 am 12 Sep 2026 (local time)

Forecast update in  hr  min

Today's Block Island sea temperature is
20.5°C
0.4° 

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 Sep 2026:

  • Most powerful swell: Wednesday 16 Sep, 2PM (local time) - 2.5ft (0.8m), 8s period, ESE swell with 77 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 0.8m 8s and forecast to arrive on Wednesday (Sep 16) at 2PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 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 Powerful 2PM (Wed 16th Sep)2.5ft (0.8m) 8s

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 the menu for our local spot.

Alright, grab a coffee, because we've got a long wait ahead. Looking at the next 16 days for Block Island, the honest truth is that the surf is flat and unrideable for the first ten days straight. From Saturday the 12th right through to the end of Monday the 21st, it's a wasteland of tiny, weak waves blown out by onshore winds. We're talking swell heights barely reaching 1 ft to 4 ft with energy readings that are basically a whisper (29 to 88). The only window of half-decent shape is on Sunday the 13th afternoon, when a 3 ft S swell gets a brief period of clean offshore wind from the NNW, but that tiny 5-second period means it's all mush and no push. It's a tough run, but that's the rhythm of this place sometimes.

That all changes in the final week. The real standout, and the only window worth getting excited about, is the morning of Wednesday the 23rd of September. The energy jumps to a solid 531, with a clean 7 ft E swell rolling in. The wind is a light offshore from the W, which should leave the surf clean and lined up. At 7 ft, that's a proper size, better suited to experienced surfers. The period is a moderate 8 seconds, which is fine for this point break setup. It’s the one clear gem in an otherwise rough patch.

Following that, the 24th of September sees the biggest swell of the period, with 8 ft of E to ESE swell packing serious energy (1056 to 1086), but howling onshore winds at 28 mph are going to shred it to pieces. Not one to paddle out for. The morning of Saturday the 26th is a decent fallback, with a 3 ft ESE swell and light winds. The energy is a moderate 222, and it should be cleaner than anything we’ve seen, but it’s a distant second to that Wednesday morning.

So, circle the 23rd of September. That’s the one.

Rusty.

Short Range Forecast

Heavy rain (total 69mm), heaviest during Sun morning. Warm (max 23°C on Mon afternoon, min 16°C on Mon night). Winds increasing (light winds from the NNW on Sun night, fresh winds from the NNE by Mon night).

Days 4-6 Weather Summary

Mostly dry. Warm (max 22°C on Thu night, min 14°C on Tue night). Winds decreasing (fresh winds from the NE on Tue morning, calm by Wed afternoon).

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
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)
0.3
SE
9
0.3
SE
10
0.4
SE
10
0.4
SE
10
0.9
S
5
0.9
S
6
0.4
SE
9
0.6
SE
6
0.4
SE
9
1.2
ENE
5
1
E
5
0.8
E
7
0.8
ESE
7
0.8
ESE
8
0.7
ESE
7
0.6
E
7
0.5
E
7
0.8
SW
4
0.9
SW
5
0.5
SW
4
0.3
SE
12
Wave Graph
Metric surfscale
Energy kJ
14
15
34
33
42
56
27
30
19
73
54
59
71
77
57
37
25
23
31
9
25
Wind (km/h)
15
ESE
10
SSE
20
S
20
SSW
15
NNW
15
SW
20
N
5
NNE
25
NE
25
ENE
25
E
10
ENE
10
ENE
5
SSW
10
SW
10
SSW
20
SSW
25
SW
20
W
15
NW
30
NNE
Wind State
cross-on
on
on
cross-on
off
cross
cross-off
cross-off
cross-off
cross
cross-on
cross
cross
cross-on
cross
cross-on
cross-on
cross-on
cross-off
cross-off
cross-off
High Tide
9:16AM1.09m
9:33PM0.93m
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
Low Tide
3:32PM-0.01m
3:29AM0.02m
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
clear
clear
part cloud
heavy rain
rain showers
rain showers
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
cloud
rain showers
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:22
6:24
6:24
6:26
6:26
6:28
6:28
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:00
6:59
6:58
6:55
6:53
6:52
6:51
 mm
42
23
1
3
4
Temp °C
19
21
22
22
21
22
19
23
21
16
17
17
15
16
18
18
19
22
22
20
22
Feels °C
17
20
22
23
23
22
15
22
16
12
13
13
14
16
17
18
18
22
22
19
19
  • 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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