Block Island Surf Break

Lat Long: 41.15° N 71.59° W

Block Island Surf Forecast and Surf Report

Issued: 7 pm 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 13 Sep 2026:

  • Most powerful swell: Wednesday 16 Sep, 5PM (local time) - 2.5ft (0.8m), 8s period, ESE swell with 90 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 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Tuesday (Sep 15) at 5AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Wed 16th Sep)2.5ft (0.8m) 8s

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


The Lowdown

Alright, let’s get into it. It’s Rusty here, and I’ve been staring at the charts for Block Island for the next couple of weeks, and honestly, my heart’s a little heavy. We’ve got a long stretch of small, weak surf ahead. The first real window of opportunity doesn't even show up until Monday the 22nd, so we’re staring down a solid eight-day drought before anything gets remotely interesting. The swell energy is barely registering, with values mostly in the double digits – like 61, 46, even down to 18 – that’s just not enough to get the heart pumping.

The early days are all about waiting. The winds are mostly messy, with cross-shore and cross-onshore breezes chopping up an already tiny ocean. There are a couple of clean windows here and there, like Monday the 15th afternoon when it goes glassy, but the swell is a pathetic 2ft. And that near-gale on Saturday the 19th with 31 mph winds is more about survival than surfing. We might see a bit of texture bump on the 21st, but the wind is howling out of the northeast at 25 mph, making it a messy, lumpy mess. It’s not until the 22nd that the energy gauge finally starts to climb.

Now, that Monday the 22nd is where things change. We’re looking at a proper spike in energy – 411 on Tuesday morning, jumping to a solid 553 by the afternoon. The swell is picking up to 6ft-6ft, coming from the east, with a period of 8-9 seconds. That’s a solid, powerful push. The catch? The wind is cross-shore and pretty fresh at 22 mph, so it’s going to have some lumps on it. This isn't one for the beginners; that size and chop will test you. The cleanest windows in this period look like the 23rd and 24th, as the wind switches to a cross-off from the northeast, cleaning up that solid 4ft-5ft of east-southeast swell. Long period swells are prone to breaking too straight at beach breaks and are best at point breaks, reefs and rivers, and Block Island is a point break, so it could be worth the paddle. The energy is still moderate to strong, with readings of 314-359.

After that pulse, it fades quickly. By the 25th, we’re already back to marginal conditions with energy dropping to 223, and the rest of the week is just a slow slide back into the doldrums with small waves and a lot of wind. There’s a faint whisper of a glassy morning on the 27th, but the swell is gone, down to 1ft with an energy of just 53. So, don’t get your hopes up for a big finale. The standout is clearly Tuesday the 22nd and the clean, bigger surf on the 23rd and 24th. It’s promising, but a week and a half out, we keep our fingers crossed and check the charts again. Stay tuned.

Rusty.

Short Range Forecast

Heavy rain (total 68mm), heaviest during Sun morning. Warm (max 23°C on Mon afternoon, min 15°C on Mon night). Mainly fresh winds.

Days 5-7 Weather Summary

Some drizzle, heaviest during Fri afternoon. Warm (max 22°C on Thu night, min 15°C on Tue night). Wind will be generally light.

Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
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)
0.4
SE
10
0.4
SE
10
0.9
SSW
6
0.8
SSW
6
0.5
SE
9
0.5
SE
8
0.4
SE
9
0.3
SE
9
0.8
E
5
0.8
E
7
0.8
E
8
0.8
ESE
8
0.7
ESE
8
0.6
E
7
0.6
E
7
0.5
ESE
7
0.5
ESE
6
0.5
ESE
6
1
E
5
Wave Graph
Metric surfscale
Energy kJ
34
33
57
36
37
32
19
13
29
68
80
90
58
37
37
26
23
22
41
Wind (km/h)
15
SSE
20
ESE
15
N
20
SW
25
NNW
5
NNE
30
NE
20
ENE
15
ESE
5
E
5
ESE
10
SW
5
SW
10
ESE
20
SE
20
SSW
25
WSW
20
N
50
NE
Wind State
on
cross-on
off
cross
off
cross-off
cross-off
cross
cross-on
cross-on
glassy
cross
glassy
cross-on
on
cross-on
cross
off
cross-off
High Tide
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
3:29AM0.02m
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
part cloud
heavy rain
rain showers
rain showers
rain showers
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
rain showers
heavy rain
<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
<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
51
13
1
3
1
16
Temp °C
21
21
21
22
18
23
21
16
17
16
16
17
18
18
18
22
22
22
17
Feels °C
20
21
22
24
14
21
15
12
15
14
16
16
17
18
16
22
22
21
13
  • 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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