Surf Forecasts:
Block Island surf forecast from 8 Sep 2026:
- Best quality surf: Thursday 10 Sep, 11PM (local time) - 5ft (1.6m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 10 Sep, 8AM (local time) - 8ft (2.5m), 7s period, SW swell with 698 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 11PM (local time) - 5ft (1.6m), 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 1.6m and 7s period with a secondary swell of 0.3m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Block Island in the next 16 days are 2.5m 7s and forecast to arrive on Thursday (Sep 10) at 8AM. 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 4s period and expected on Wednesday (Sep 09) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 10th Sep) | 5ft (1.6m) 7s |
| Best Surf | 11PM (Thu 10th Sep) | 5ft (1.6m) 7s |
| Most Powerful | 8AM (Thu 10th Sep) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here, and I’ve been staring at the charts for Block Island, and to be honest, it’s a tough stretch. We’re looking at a long, quiet run with not much to get excited about for the first two weeks of September. The first real sniff of anything surfable doesn’t show up until the very end of the run.
We’ve got a solid two-week gap with little to no surf on offer. The first few days are flat or junk. The wind is mostly cross or cross-onshore, with a lot of lumpy, choppy conditions. The waves that do show are small, weak, and messy. The water temp is about 69°, which is pretty normal for this time of year, so at least the water feels good.
There’s a brief moment on the morning of Friday the 11th where the wind swings offshore from the NNW, and it’s clean. But the swell is only 3 ft, from the SSW, with a short period of 7 seconds, so the combined energy is a weak 76 – it’s just not enough push to make it worthwhile. The waves are there, but they’re gutless.
The only real standout, and I mean the *only* one, is the morning of Monday the 21st of September. The swell bumps up to 5.5 ft from the east, with a period of 6 seconds. The combined energy gets up to 211 (moderate), and the wind is a clean, cross-off from the NE. It’s still not a groundswell, but for a beach break setup, that clean wind makes it look a lot more promising. It’s a marginal call, but it’s the best we’ve got. The rest of that week is a write-off again with onshore wind and lumpy conditions.
Bottom line: if you’re desperate, you could maybe get a session on the 21st, but don’t hold your breath. This is a proper lull.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu night. Warm (max 24°C on Tue afternoon, min 19°C on Thu night). Winds increasing (light winds from the SW on Wed morning, strong winds from the SW by Wed night). | Days 5-7 Weather SummarySome drizzle, heaviest during Sun afternoon. Warm (max 23°C on Fri afternoon, min 15°C on Sat morning). Wind will be generally light. | |||||||||||||||||||
Tue 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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) | SW 4 | SE 9 | E 9 | SSW 4 | SW 7 | SW 7 | SW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 10 | SE 10 | SE 10 | SE 9 | SSE 5 | SE 6 | SSE 6 | SE 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 10 | 12 | 6 | 31 | 458 | 552 | 418 | 142 | 62 | 78 | 51 | 14 | 15 | 24 | 46 | 42 | 32 | 39 | 46 | 39 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | cross-on | cross-on | cross | cross | cross-off | off | cross-off | cross-off | cross-off | cross-on | cross | cross-on | cross | cross-on | cross | cross-on | cross-off |
High Tide | 6:31PM1.01m | 6:57AM0.97m | 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 | |||||||
Low Tide | 1:06AM0.01m | 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 | |||||||
 |  | |  |  | | |  |  | |  | | | | |  | | | | | |
 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — |
 | 7:07 | — | — | 7:06 | — | — | 7:04 | — | — | 7:02 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — |
mm | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 24 | 24 | 22 | 22 | 22 | 23 | 24 | 24 | 20 | 23 | 22 | 17 | 19 | 20 | 21 | 19 | 21 | 21 | 23 | 23 |
Feels °C | 21 | 20 | 23 | 20 | 18 | 18 | 22 | 23 | 18 | 20 | 17 | 15 | 18 | 20 | 20 | 17 | 22 | 21 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | SE 9 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 6 | SSW 6 | SE 10 | SE 10 | SE 9 | SSE 5 | SE 6 | SSE 6 | SE 6 |
| kJ | 8 | 12 | 3 | 14 | 12 | 13 | 13 | 142 | 62 | 78 | 51 | 12 | 6 | 24 | 46 | 42 | 14 | 39 | 46 | 39 |
Swell 2 Height (m) Direction Period (s) | E 8 | E 9 | SE 10 | E 9 | E 8 | E 8 | SE 7 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SE 10 | SSW 5 | SW 5 | SE 4 | SE 9 | S 6 | SE 9 | SE 9 |
| kJ | 6 | 6 | 4 | 2 | 1 | 1 | 2 | 11 | 14 | 14 | 14 | 14 | 15 | 3 | 1 | 4 | 29 | 28 | 19 | 20 |
Swell 3 Height (m) Direction Period (s) | S 6 | S 6 | E 9 | — | — | — | — | E 8 | WNW 4 | — | S 7 | SE 6 | SSE 5 | SSE 6 | S 9 | SW 4 | SW 4 | SE 9 | SSW 6 | SW 5 |
| kJ | 1 | 1 | 6 | — | — | — | — | 1 | 1 | — | 1 | 1 | 3 | 3 | 2 | 4 | 3 | 27 | 3 | 1 |
Wind waves Height (m) Direction Period (s) | SW 4 | WSW 4 | SW 4 | SSW 4 | SW 7 | SW 7 | SW 7 | — | NNE 3 | SW 3 | NNW 3 | NE 3 | — | — | S 4 | — | SSE 5 | — | — | ENE 4 |
| kJ | 10 | 10 | 4 | 31 | 458 | 552 | 418 | — | 3 | 2 | 2 | 1 | — | — | 6 | — | 32 | — | — | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 769 | 665 | 2553 | 1067 | 1084 | 195 | 237 | 0 | 24 | 24 | 49 | 776 | 634 | 249 | 152 | 24 | 201 | 24 | 749 | 25 |
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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