
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, 8AM (local time) - 8ft (2.4m), 7s period, SW swell with 590 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 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 2.4m 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 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 | 8AM (Thu 10th Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, let's talk about Block Island. I’ve been staring at the charts and the outlook is lean. This is a 16-day window, and the first solid two weeks are a total write-off for any decent paddle session. You’re looking at a long gap of nothing until the very end.
Right now, and for the next several days, the wave energy is just pathetic. We’re talking combined energies barely scratching 19 to 36 (weak). The wind is mostly cross or cross-on, and the swell is tiny, often under 3 feet and short period. Don’t even bother paddling out this week. It’s a total flat spell.
The first real bump in the road comes on Thursday, September 10th. The swell lifts to 7 feet from the SW, with a combined energy of 499 (moderate). But here’s the kicker – the wind is howling from the WSW at 19 mph, cross-shore, making it a lumpy, choppy mess. That’s not surf, that’s a washing machine. That might be interesting for the kite surfers, but for a paddle surfer, it’s a hard pass.
There’s a brief moment on Friday, September 11th morning where the wind goes offshore from the NNW at 12 mph, and the swell is 3 feet, but the energy is only 76 (weak). The period is short at 7 seconds. It would be clean, but there’s just no push. You’d be bobbing around more than riding.
The pattern continues with small, weak surf until we get to September 20th. Sunday the 20th brings a bump in swell from the E and ENE, hitting 6 to 6 feet, with combined energy jumping to 204 and 225 (moderate). But the wind is onshore or cross-onshore, so it’s going to be choppy and messy. Not a standout.
The best chance, and I mean the only chance, comes on the very last day of the forecast – Thursday, September 24th. This is the one to watch, but it’s long-range, so keep your expectations in check. The morning session shows a 3 feet swell from the S, but the period is a very long 18 seconds. That’s a proper groundswell. The combined energy is 427 (moderate), and the wind is cross-offshore from the NNE at 12 mph, which will keep the surface clean. Because that long period swell will be breaking straight at a beach setup, the quality might be a bit walled-off, but it’s the only window with a real chance of a clean, lined-up wave. For Block Island, a point break, that long period groundswell is actually a good thing.
Bottom line: there’s nothing to get excited about for the first two weeks. The true standout, if it holds, is the morning of Thursday, September 24th. That’s your best bet for a clean, offshore session. Be patient.
- Rusty
Short Range ForecastSome drizzle, heaviest during Thu morning. Warm (max 24°C on Thu night, min 19°C on Fri morning). Winds increasing (calm on Wed morning, strong winds from the SW by Wed night). | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Mon afternoon, min 17°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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) | SE 9 | E 9 | SSW 4 | SW 6 | SW 7 | SW 7 | SSW 7 | SSW 7 | SSW 6 | SSW 7 | SE 9 | SE 10 | SE 10 | SSE 5 | S 5 | S 6 | SSE 6 | SSE 6 | SE 9 |
Wave Graph | |||||||||||||||||||
12 | 7 | 19 | 408 | 485 | 340 | 168 | 62 | 41 | 35 | 15 | 15 | 24 | 49 | 53 | 102 | 56 | 38 | 20 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | cross-on | cross | cross | off | off | cross | cross-off | cross-on | on | cross-on | glassy | cross-on | glassy | glassy | glassy | cross |
High Tide | 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 | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 22 | 22 | 22 | 23 | 23 | 24 | 20 | 23 | 22 | 18 | 20 | 21 | 21 | 20 | 20 | 22 | 23 | 24 |
Feels °C | 20 | 23 | 20 | 18 | 19 | 21 | 23 | 16 | 19 | 16 | 17 | 18 | 21 | 20 | 18 | 21 | 24 | 26 | 27 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SSE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SSW 7 | SSW 7 | SSW 6 | SSW 7 | SSW 6 | SSW 6 | SE 10 | SE 10 | SE 9 | S 6 | SSE 6 | SSE 6 | SSE 5 |
12 | 7 | 15 | 19 | 13 | 13 | 168 | 62 | 41 | 35 | 15 | 6 | 24 | 33 | 30 | 102 | 56 | 38 | 11 | |
Swell 2 Height (m) Direction Period (s) | E 9 | SE 10 | E 9 | E 8 | E 8 | E 8 | SE 8 | SE 10 | SE 9 | ESE 9 | SE 9 | SE 10 | S 10 | SE 9 | — | SE 9 | SE 9 | SE 9 | SE 9 |
6 | 4 | 2 | 1 | 1 | 1 | 11 | 14 | 14 | 9 | 14 | 15 | 2 | 3 | — | 29 | 20 | 20 | 20 | |
Swell 3 Height (m) Direction Period (s) | S 5 | E 9 | — | — | — | — | E 8 | WNW 3 | — | SE 7 | SSE 5 | SSE 6 | — | — | — | — | — | SW 4 | SW 4 |
1 | 6 | — | — | — | — | 1 | 1 | — | 2 | 2 | 4 | — | — | — | — | — | 1 | 1 | |
Wind waves Height (m) Direction Period (s) | WSW 3 | SW 3 | SSW 4 | SW 6 | SW 7 | SW 7 | — | N 3 | — | — | — | — | S 5 | SSE 5 | S 5 | — | — | — | E 3 |
5 | 2 | 19 | 408 | 485 | 340 | — | 1 | — | — | — | — | 8 | 49 | 53 | — | — | — | 3 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 665 | 1095 | 1067 | 1095 | 195 | 219 | 0 | 29 | 24 | 49 | 776 | 1148 | 209 | 24 | 42 | 24 | 29 | 24 | 49 |
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.










