Surf Forecasts:
Block Island surf forecast from 9 Sep 2026:
- Best quality surf: Thursday 10 Sep, 11PM (local time) - 5ft (1.5m), 7s period, SSW swell with offshore winds.
- Most powerful swell: Thursday 10 Sep, 5AM (local time) - 7.5ft (2.3m), 7s period, SW swell with 483 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 11PM (local time) - 5ft (1.5m), 7s period with SSW 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 1.5m and 7s period with a secondary swell of 0.3m and 9s. 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 2.3m 7s and forecast to arrive on Thursday (Sep 10) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Friday (Sep 11) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 10th Sep) | 5ft (1.5m) 7s |
| Best Surf | 11PM (Thu 10th Sep) | 5ft (1.5m) 7s |
| Most Powerful | 5AM (Thu 10th Sep) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's be straight, the next couple of weeks look tough for Block Island. We've got a long stretch of tiny, messy conditions ahead.
The overall pattern is flat and wind-whipped. For the first week, from Wednesday the 9th right through to Thursday the 17th of September, it's a write-off. We're looking at swell heights barely breaking 3 ft, with most days seeing nothing more than 0.7 ft to 1.3 ft. The wind is mostly onshore or cross-shore, often fresh to strong, and the combined wave energy is weak, staying under 100 throughout that whole first period. There are a couple of moments—like Friday morning the 11th with a clean offshore from the NNW and a glassy Saturday morning the 12th—but the swell is just not there to back it up. The water temp is 68.7°F, which is about average for this time of year, nothing unusual.
There's a big gap of low-quality surf before we see anything worth mentioning.
Now, for the one standout, and you have to mark your calendar for this. Friday morning, 18th September at Block Island. This is the only window in the entire 16-day forecast that earns a real look. The morning will be glassy with a light easterly breeze, and a 5.2 ft SSW swell is forecast to roll in, with a combined energy reading of 245 (moderate energy). The period is 7 seconds, so it's a short-period wind swell, but with clean conditions it could offer some fun, rippable waves. The swell direction from the SSW aligns with the optimum for Block Island (SE), but being a short-period swell, it'll be a bit crumbly and best on the point. Keep in mind this break rarely breaks, so this is a very special window, but crowds are often a factor here, so expect company. The 5.2 ft size is approachable for intermediates but could be a bit much for absolute beginners. By Friday afternoon the wind swings onshore and it'll chop up quick.
After that Friday window, it's back to the same story: small surf (1 ft to 2.6 ft), onshore winds, and poor conditions for the rest of the period through to Thursday the 24th.
Short Range ForecastSome drizzle, heaviest during Thu morning. Warm (max 24°C on Thu afternoon, min 18°C on Fri night). Winds increasing (calm on Wed morning, strong winds from the SW by Wed night). | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Sun afternoon. Warm (max 25°C on Mon afternoon, min 18°C on Sat morning). Winds increasing (calm on Sat morning, fresh winds from the S by Sun afternoon). | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
AM | PM | 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) | E 9 | SSW 4 | SW 6 | SW 7 | SW 7 | SSW 7 | SSW 6 | SSW 7 | SSW 7 | SE 9 | SE 10 | SE 10 | SE 10 | SSW 5 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SSE 5 | S 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7 | 22 | 292 | 379 | 314 | 142 | 60 | 84 | 41 | 15 | 15 | 24 | 33 | 30 | 29 | 27 | 27 | 27 | 20 | 26 | 86 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross | off | off | cross | off | glassy | cross-on | cross-on | cross-on | cross-on | cross-off | off | cross-on | on | on | cross-on | cross |
High Tide | 7:21PM1.02m | 7:46AM1.04m | 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 | ||||||||
Low Tide | 1:09PM-0.02m | 1:47AM-0.02m | 2:00PM-0.03m | 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 | |||||||
 | |  |  |  |  | | |  | | | |  |  |  | | | | | | | |
 | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — |
 | — | 7:06 | — | — | 7:04 | — | — | 7:02 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:55 | — |
mm | — | — | — | 1 | — | — | — | — | — | — | — | — | 1 | 9 | 6 | — | — | — | — | — | — |
Temp °C | 22 | 23 | 22 | 23 | 24 | 24 | 20 | 22 | 23 | 19 | 21 | 22 | 20 | 21 | 23 | 23 | 25 | 25 | 22 | 23 | 24 |
Feels °C | 20 | 21 | 19 | 19 | 21 | 23 | 17 | 19 | 19 | 19 | 19 | 20 | 17 | 18 | 24 | 25 | 26 | 26 | 23 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SSW 7 | SSW 6 | SSW 7 | SSW 7 | SSW 6 | SSW 6 | SE 10 | SE 10 | SE 9 | SE 9 | SSW 5 | S 5 | SE 9 | SE 9 | ESE 9 | ESE 9 |
| kJ | 7 | 14 | 12 | 13 | 13 | 142 | 60 | 84 | 41 | 15 | 6 | 24 | 33 | 30 | 29 | 23 | 13 | 27 | 20 | 8 | 8 |
Swell 2 Height (m) Direction Period (s) | SE 10 | E 9 | E 8 | SSE 7 | E 8 | SE 8 | SE 9 | SE 9 | ESE 9 | SE 9 | SE 10 | SSW 5 | — | — | S 10 | SE 9 | SE 9 | SE 15 | SE 15 | ESE 7 | SE 14 |
| kJ | 4 | 2 | 1 | 5 | 1 | 11 | 12 | 14 | 8 | 14 | 15 | 3 | — | — | 2 | 27 | 27 | 8 | 8 | 5 | 7 |
Swell 3 Height (m) Direction Period (s) | E 9 | — | — | E 8 | — | — | — | — | SSE 7 | SSE 6 | SSE 6 | S 9 | — | — | — | SSE 4 | — | — | SE 15 | SE 15 | — |
| kJ | 6 | — | — | 1 | — | — | — | — | 4 | 4 | 4 | 2 | — | — | — | 3 | — | — | 8 | 8 | — |
Wind waves Height (m) Direction Period (s) | SW 2 | SSW 4 | SW 6 | SW 7 | SW 7 | — | NW 3 | — | NNW 2 | — | — | SSW 5 | SSW 4 | SSW 5 | SSW 5 | — | — | S 5 | S 5 | SSE 5 | S 6 |
| kJ | 1 | 22 | 292 | 379 | 314 | — | 2 | — | 1 | — | — | 9 | 11 | 28 | 26 | — | — | 12 | 11 | 26 | 86 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 709 | 1067 | 1805 | 204 | 251 | 0 | 25 | 81 | 29 | 776 | 1156 | 249 | 347 | 225 | 24 | 29 | 642 | 665 | 615 | 3324 | 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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