Surf Forecasts:
Block Island surf forecast from 12 Sep 2026:
- Most powerful swell: Wednesday 16 Sep, 11AM (local time) - 3ft (0.9m), 8s period, ESE swell with 112 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 0.9m 8s and forecast to arrive on Wednesday (Sep 16) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Tuesday (Sep 15) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Wed 16th Sep) | 3ft (0.9m) 8s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's break down the Block Island forecast in feet and knots, the way we feel it.
It's a grim start, I'm not gonna lie. From Saturday, September 12th all the way through Thursday, September 24th, the surf is practically flat. You're looking at waves from 1 to 3 feet, with short periods of 10 seconds or less. The swell energy is barely a whisper (29 to 120). It's a whole lot of nothing—small, weak, and just not worth the effort to get wet. Even when the wind is light or offshore, there's just no power in the water.
Now, if you're patient, there's a bit of light at the end of the tunnel. Things finally show some signs of life on Friday, September 25th. We get a bump in swell to 5 to 6 feet from the E and ESE, with a period of 7 to 8 seconds. The combined energy hits 227 to 306 (moderate wave energy), which finally feels like a real swell. The pick of the window is Friday morning, with a fresh offshore wind from the NNW at 19 knots. That will groom the point at Block Island nicely, setting up some clean lines on that 5-foot east swell. It's decent for intermediates, though that 5-foot mark might be a bit much for beginners. And just a heads up, the crowds are "often" around here, so expect some company.
Saturday the 26th is still in the game, with 5 feet from the ESE, but the wind shifts to a light cross-onshore from the SSW at 6 knots. It'll still be surfable, just not as glassy as Friday.
Sunday the 27th sees the swell period stretch to 11 seconds (a nice, long groundswell) and energy up to 393 (moderate to strong energy), but the wind cranks up to a fresh cross-onshore at 22 knots from the SW. That's going to chop it up and make it lumpy—a pass for most.
So here's the short of it: if you can wait, Friday, September 25th morning is the one to circle on your calendar. It's the only real chance for decent, clean waves in this whole 16-day stretch. The rest is a flat period with a little tease at the end.
Rusty, out.
Short Range ForecastHeavy rain (total 59mm), heaviest during Sun afternoon. Warm (max 22°C on Fri night, min 17°C on Sat morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Mon night, min 14°C on Tue morning). Winds decreasing (fresh winds from the NE on Mon night, calm by Wed afternoon). | ||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | SSW 6 | SE 9 | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | ESE 9 | E 5 | E 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 7 | ESE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 22 | 14 | 15 | 34 | 33 | 30 | 29 | 38 | 31 | 20 | 8 | 32 | 88 | 112 | 94 | 87 | 60 | 39 | 16 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | on | on | on | cross-off | cross-off | off | cross-off | cross-off | cross | cross | cross-off | cross | glassy | cross-on | cross-on | cross-on | cross |
High Tide | 8:50PM0.98m | 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 | ||||||
Low Tide | 2:59AM-0.02m | 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 | |||||||
 |  | |  |  |  | | | | | | | | | | | | | | |
 | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:26 | — | — | 6:28 | — | — |
 | 7:02 | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:55 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | 18 | 29 | — | 12 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 18 | 20 | 22 | 22 | 22 | 21 | 19 | 22 | 21 | 16 | 17 | 16 | 15 | 16 | 18 | 19 | 19 | 21 |
Feels °C | 20 | 16 | 20 | 21 | 21 | 25 | 22 | 16 | 19 | 17 | 12 | 13 | 12 | 14 | 16 | 17 | 17 | 16 | 18 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SSW 5 | SE 10 | SE 10 | SSE 5 | SE 5 | S 5 | SE 8 | SE 8 | S 6 | ESE 7 | E 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 7 | ESE 7 |
| kJ | 22 | 11 | 6 | 34 | 33 | 15 | 23 | 19 | 31 | 20 | 3 | 9 | 88 | 112 | 94 | 87 | 60 | 39 | 16 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 10 | SSW 5 | — | SE 9 | SE 9 | SE 9 | SSW 6 | S 6 | ESE 9 | S 7 | S 7 | SE 13 | SE 13 | SE 13 | SE 12 | SE 12 | ESE 12 |
| kJ | 13 | 14 | 15 | 2 | — | 30 | 29 | 38 | 11 | 2 | 8 | 4 | 1 | 7 | 7 | 7 | 6 | 6 | 15 |
Swell 3 Height (m) Direction Period (s) | SSE 6 | SSE 6 | ENE 3 | — | — | SW 5 | — | — | — | ESE 9 | S 15 | SE 9 | SE 14 | S 6 | — | — | — | — | SE 9 |
| kJ | 4 | 4 | 1 | — | — | 6 | — | — | — | 8 | 4 | 3 | 7 | 1 | — | — | — | — | 3 |
Wind waves Height (m) Direction Period (s) | — | NE 4 | — | SSE 4 | SSE 5 | — | SW 5 | N 3 | NW 3 | NE 4 | ENE 5 | E 5 | — | — | — | — | — | SW 3 | SW 4 |
| kJ | — | 3 | — | 13 | 24 | — | 8 | 3 | 1 | 24 | 83 | 32 | — | — | — | — | — | 6 | 16 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 645 | 776 | 743 | 445 | 178 | 24 | 24 | 182 | 85 | 249 | 156 | 1095 | 25 | 115 | 24 | 24 | 131 | 844 | 195 |
Best forecast wave conditions in Rhode Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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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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