Surf Forecasts:
Block Island surf forecast from 25 Aug 2026:
- Most powerful swell: Wednesday 26 Aug, 11PM (local time) - 2.5ft (0.8m), 9s period, ESE swell with 94 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 0.8m 9s and forecast to arrive on Wednesday (Aug 26) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 5s period and expected on Wednesday (Aug 26) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Wed 26th Aug) | 2.5ft (0.8m) 9s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on the table for Block Island.
Honestly, the next week and a half or so is pretty flat. We’ve got a long stretch of small, weak, and messy surf from now through the start of September, with nothing worth paddling out for. The wind is mostly cross or onshore and the wave heights are tiny, barely pushing 3 ft. The combined swell energy is weak, often under 100 (54-136), and the period is short, so the waves lack any punch. It’s a lot of wind chop and close-outs. We’re looking at a good 9 days of poor surf conditions.
The first real glimmer of hope shows up on Thursday, September 3rd. That’s the standout window. The morning is where it’s at: a clean, light breeze from the NE, offshore for the point, with wave height hitting 5 ft from the ESE. The combined swell energy jumps to 706 (moderate to strong), and the period is 8 seconds, so it’s not groundswell but there’ll be some push. The afternoon gets a bit sloppy as the wind swings onshore, but that morning session at Block Island point should offer the best waves of the whole outlook. It’s a rare breaking spot, so when it lines up, you get on it. Crowds are likely, but for this quality, you’ll deal with it.
After that, Friday the 4th holds some clean leftover energy in the morning with 4 ft and offshore NNW wind at 3 mph. The combined energy is 414 (moderate). It’ll be a good follow-up day, but not as strong as Thursday. Then it fades again into smaller, longer-period (13 seconds) SE swell on Friday afternoon, but the wind is better then. After that, the surf drops off and gets messy again through the second week.
For the second week, there’s a long period (15-second) swell on Tuesday, September 1st, but it’s only 1 ft. That’s barely a ripple, so forget it. The real action is that Thursday morning shot.
Overall, there’s one true standout: the morning of Thursday, September 3rd at Block Island point. Clean, offshore, decent size from the ESE. Don’t sleep on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Mon night, min 18°C on Wed morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Thu night. Warm (max 25°C on Fri afternoon, min 17°C on Sat morning). Winds decreasing (fresh winds from the S on Thu night, calm by Sun morning). | ||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 11 | SW 4 | SW 5 | SE 9 | SE 8 | ESE 8 | SE 8 | SE 9 | SE 8 | SSW 6 | SSW 6 | SE 8 | SE 7 | SSW 6 | SSW 6 | SE 8 | SE 8 | SE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 50 | 29 | 25 | 28 | 61 | 72 | 90 | 72 | 77 | 72 | 77 | 55 | 72 | 49 | 68 | 41 | 35 | 24 | 22 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | off | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | off | off | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 6:56AM0.76m | 7:13PM0.89m | 7:35AM0.82m | 7:47PM0.91m | 8:10AM0.87m | 8:18PM0.93m | 8:43AM0.91m | 8:50PM0.94m | 9:14AM0.95m | 9:25PM0.94m | 9:47AM0.98m | 10:03PM0.92m | |||||||
Low Tide | 00:57AM0.14m | 12:50PM0.15m | 1:31AM0.09m | 1:30PM0.11m | 2:02AM0.05m | 2:08PM0.09m | 2:30AM0.02m | 2:43PM0.07m | 2:55AM0.01m | 3:19PM0.05m | 3:22AM0.00m | 3:56PM0.05m | 3:52AM0.01m | ||||||
 |  |  | | | | | |  |  |  | |  | | | | | | | |
 | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 7:31 | — | 7:30 | — | — | 7:29 | — | — | 7:27 | — | — | 7:25 | — | — | 7:23 | — | — | 7:22 | — |
mm | — | — | — | — | — | — | — | — | — | 3 | 3 | — | — | — | — | — | — | — | — |
Temp °C | 24 | 21 | 23 | 23 | 19 | 22 | 23 | 23 | 24 | 24 | 24 | 25 | 24 | 19 | 22 | 22 | 21 | 22 | 22 |
Feels °C | 21 | 17 | 20 | 21 | 18 | 20 | 20 | 22 | 24 | 23 | 25 | 26 | 25 | 16 | 19 | 19 | 21 | 19 | 19 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | S 6 | SE 6 | SW 5 | SE 9 | SE 8 | ESE 8 | SE 8 | SE 9 | SE 8 | SE 8 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SE 8 | SE 8 | SE 8 |
| kJ | 50 | 17 | 10 | 28 | 61 | 72 | 90 | 72 | 77 | 72 | 57 | 55 | 72 | 43 | 68 | 41 | 35 | 24 | 22 |
Swell 2 Height (m) Direction Period (s) | SE 11 | ESE 6 | SE 10 | SE 10 | SW 4 | — | S 6 | — | E 11 | E 11 | E 10 | SE 8 | SE 8 | SE 7 | SE 8 | SE 8 | SSW 6 | SSW 6 | — |
| kJ | 18 | 8 | 17 | 26 | 7 | — | 2 | — | 9 | 2 | 2 | 55 | 63 | 49 | 31 | 24 | 13 | 10 | — |
Swell 3 Height (m) Direction Period (s) | ESE 7 | SE 11 | E 6 | ESE 6 | E 6 | — | — | — | — | — | — | E 10 | E 9 | E 9 | E 10 | E 9 | — | E 9 | — |
| kJ | 5 | 29 | 1 | 3 | 1 | — | — | — | — | — | — | 2 | 2 | 2 | 2 | 2 | — | 2 | — |
Wind waves Height (m) Direction Period (s) | — | W 3 | SW 4 | W 5 | SW 4 | SW 3 | SW 3 | SSW 5 | SSW 4 | SSW 5 | SSW 6 | — | — | NNW 3 | NNW 3 | WNW 3 | — | — | SSW 3 |
| kJ | — | 2 | 25 | 10 | 5 | 6 | 4 | 11 | 16 | 66 | 77 | — | — | 2 | 1 | 2 | — | — | 7 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 24 | 159 | 198 | 25 | 24 | 24 | 24 | 133 | 1148 | 198 | 24 | 24 | 26 | 24 | 24 | 24 | 634 | 2583 | 2371 |
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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