Surf Forecasts:
Block Island surf forecast from 11 Sep 2026:
- Best quality surf: Thursday 10 Sep, 11PM (local time) - 4ft (1.2m), 7s period, SW swell with offshore winds.
- Most powerful swell: Thursday 10 Sep, 11PM (local time) - 4ft (1.2m), 7s period, SW swell with 135 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 11PM (local time) - 4ft (1.2m), 7s period with SW swell.
Best Forecast Surf Conditions for Block Island this week:
The surf forecast for Block Island over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 10) at 11PM. The primary swell is predicted to be 1.2m and 7s period with a secondary swell of 0.3m and 10s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Block Island in the next 16 days are 1.2m 7s and forecast to arrive on Thursday (Sep 10) at 11PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Monday (Sep 14) at 11AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 10th Sep) | 4ft (1.2m) 7s |
| Best Surf | 11PM (Thu 10th Sep) | 4ft (1.2m) 7s |
| Most Powerful | 11PM (Thu 10th Sep) | 4ft (1.2m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, let’s get straight into it. Block Island’s a tricky spot, and this run is no exception. We’re looking at a long, quiet stretch before anything worth paddling out for shows up. The first real sniff of surf isn’t until much later, so be patient.
From now through most of the period, it’s flat or near-flat. Tiny waves, poor conditions, and wind that’s all over the place. A couple of days in the middle of the month see a weak spike of energy—like Friday the 18th afternoon and Saturday the 22nd—but the wind is messy, mainly cross or cross-onshore, and the swell quality is just poor. You’d be fighting chop and onshore slop for knee-high nothing. Not worth it.
The standout window, if we can call it that, arrives on Friday the 25th afternoon at Block Island (point break). Swell comes from the SSE at 3ft, with a period of 11 seconds—decent long-period groundswell that should wrap nicely into the point. The wind is a strong northeast cross-offshore, which will keep the faces clean. Combined energy hits 236 (moderate), so there’s some push behind it. The break rarely breaks, so when it does line up, it’s a rare treat. Crowds are often a thing here, so expect company.
Then Saturday the 26th morning pumps up a bit more: SSE swell at 4ft, 12-second period, and combined energy of 494 (strong). That’s the best size of the whole run. But here’s the catch—wind swings west-southwest, fresh and cross, making conditions lumpy. The point might still handle it, but it’ll be more of a battle. That’s one for experienced crew only; at 4ft, it’s still okay for intermediates with some skill, but anything over 5ft would be pushing it for beginners.
The rest of the week after that? More clean offshore wind on Friday the 25th morning and Thursday the 24th afternoon, but wave heights are small or mixed. Nothing else really grabs you.
Honestly, Block Island is rolling the dice here. The surf is inconsistent, and most of the window is a bust. If you’re desperate, target that Friday afternoon the 25th for the cleanest conditions, or Saturday morning the 26th for the most power, but expect it to be lumpy and busy.
Stay tuned—forecasts shift, and it doesn’t usually stay this poor for long.
- Rusty
Short Range ForecastHeavy rain (total 29mm), heaviest during Sun morning. Warm (max 26°C on Thu night, min 18°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Sun night, min 16°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 7 | SSW 6 | SSW 6 | SSW 6 | SE 9 | SE 10 | SE 10 | SSE 5 | SSE 5 | SE 6 | SE 9 | SE 7 | SE 8 | E 6 | ESE 9 | SE 9 | E 7 | SW 4 | SW 4 |
Wave Graph  | |||||||||||||||||||
 kJ | 110 | 44 | 26 | 31 | 15 | 15 | 24 | 47 | 36 | 38 | 27 | 38 | 28 | 27 | 16 | 13 | 9 | 18 | 7 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross | cross-off | cross | on | on | cross | cross-off | cross-off | off | on | cross-off | cross-on | on | cross-on | cross-on | cross-on | cross |
High Tide | 8:07PM1.01m | 8:32AM1.08m | 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 | ||||||
Low Tide | 2:25AM-0.03m | 2:47PM-0.03m | 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 | |||||||
 |  |  |  | | |  |  |  | | | | | | | | | | | |
 | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:26 | — | — |
 | 7:04 | — | 7:02 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:55 | — | — | 6:53 | — |
mm | — | — | — | — | — | — | 2 | 26 | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 21 | 24 | 24 | 19 | 21 | 22 | 22 | 23 | 24 | 21 | 22 | 21 | 18 | 18 | 19 | 19 | 20 | 21 |
Feels °C | 25 | 18 | 20 | 21 | 18 | 20 | 20 | 22 | 24 | 25 | 18 | 21 | 20 | 16 | 17 | 15 | 16 | 17 | 19 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SE 10 | SE 10 | SSE 5 | SE 6 | SE 6 | SE 7 | SE 8 | SSW 6 | ESE 9 | ESE 6 | E 7 | ESE 7 | E 6 |
| kJ | 110 | 44 | 26 | 31 | 15 | 6 | 24 | 33 | 36 | 38 | 22 | 38 | 28 | 7 | 16 | 11 | 9 | 15 | 2 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 10 | S 9 | SE 10 | SE 9 | SE 9 | SE 9 | SSW 6 | SSW 6 | ESE 8 | SSW 6 | SE 9 | ESE 5 | SE 5 | SSE 5 |
| kJ | 14 | 14 | 13 | 13 | 14 | 15 | 2 | 33 | 30 | 29 | 27 | 12 | 12 | 6 | 3 | 13 | 2 | 1 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | SSE 6 | SSE 6 | S 9 | — | — | — | — | SW 4 | NE 4 | S 15 | ESE 9 | SE 6 | SE 14 | ESE 9 | SE 9 | SE 9 |
| kJ | — | — | — | 4 | 4 | 1 | — | — | — | — | 3 | 5 | 4 | 8 | 1 | 7 | 9 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | — | NNW 2 | WSW 2 | NNE 2 | — | SSE 6 | SSE 4 | SSE 5 | — | SW 5 | N 3 | ENE 5 | E 5 | E 6 | ESE 4 | SSW 6 | SW 3 | SW 4 | SW 4 |
| kJ | — | 1 | 1 | 1 | — | 7 | 18 | 47 | — | 5 | 5 | 12 | 23 | 27 | 5 | 6 | 6 | 18 | 7 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 24 | 49 | 645 | 49 | 1156 | 1156 | 249 | 24 | 24 | 24 | 163 | 30 | 207 | 634 | 1008 | 2371 | 249 | 249 | 256 |
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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