Surf Forecasts:
Block Island surf forecast from 25 Aug 2026:
- Best quality surf: Friday 28 Aug, 11PM (local time) - 4ft (1.2m), 8s period, S swell with cross-offshore winds.
- Most powerful swell: Saturday 29 Aug, 2AM (local time) - 4.5ft (1.3m), 7s period, S swell with 183 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 11PM (local time) - 4ft (1.2m), 8s period with S 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 Friday (Aug 28) at 11PM. The primary swell is predicted to be 1.2m and 8s period with a secondary swell of 0.6m and 8s. 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 1.3m 7s and forecast to arrive on Saturday (Aug 29) at 2AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Tuesday (Aug 25) at 11AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Fri 28th Aug) | 4ft (1.2m) 8s |
| Best Surf | 11PM (Fri 28th Aug) | 4ft (1.2m) 8s |
| Most Powerful | 2AM (Sat 29th Aug) | 4.5ft (1.3m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, it’s your local surf reporter Rusty here, checking in on the prospects for Block Island.
Look, I gotta be straight with you – this 16-day window starts off pretty grim. For over a week, we’ve got mostly small, weak swells and the wind is just not playing ball. From the 25th of August right through to the 4th of September, it’s basically a write-off. The waves are tiny – mostly 1 ft to 3 ft – blown out by cross-shore and cross-onshore breezes, creating lumpy, choppy conditions. There’s a lot of frustrated scanning of the horizon ahead, and no real reason to paddle out. About the only highlight in that first stretch is a bit of clean surf on the morning of Saturday the 29th of August, with a small 3-ft, 7-second swell from the SSW and a cross-offshore NNE breeze at 12 mph – clean, but barely enough energy to push you down the line. Still, that’s just a blip in a long, flat spell.
Now, there’s a little shift heading into the first week of September. The 2nd looks clean in the morning, but again the swell is a weak 2 ft. The real glimpse of hope shows up on the 5th of September (Saturday morning), with a bit more energy coming through – 3 ft from the ESE, 10-second period and a clean, cross-offshore breeze at 12 mph. The combined swell energy hits 214 (moderate), but the forecast still calls it marginal. It’s something to keep an eye on, but don't get carried away.
The Standout
If you’ve got patience, the prize is Monday the 7th of September. This is the one. The morning session looks like it will deliver the best waves of the entire 16-day run. We’re looking at a proper SSW swell pushing 6 ft with a period of 8 seconds. The combined energy reads 505 (strong) – that’s serious power. And what sets this apart is the wind: a light offshore from the NNW at just 9 mph, keeping the surf clean and lined up. This is solid intermediate-to-expert territory given the size (over 5 ft), but for those who can handle it, the setup at Block Island (a point break that rarely breaks) is a rare treat. Just be aware, it *rarely* breaks, so to see it firing like this is special. The downside? It’s often crowded, so get out early. The water temp is 69°, which is about normal for the time of year, so a steamer might be optional on a sunny morning.
After that gem, the 8th and 9th of September fade back into small, onshore slop, so make the most of that Monday.
So there it is: a long wait, but one clear standout. Keep your eyes on that 7th of September.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu night. Warm (max 24°C on Thu afternoon, min 18°C on Wed morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Fri morning. Warm (max 24°C on Fri morning, min 18°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | SE 11 | SW 4 | SE 10 | SE 9 | SE 8 | SE 8 | SE 8 | SE 9 | SE 8 | SE 8 | SE 8 | S 7 | SSW 7 | SSW 7 | SE 7 | S 6 | SE 8 | SE 8 | SSW 4 | SSW 5 | SSW 6 |
Wave Graph | |||||||||||||||||||||
29 | 24 | 26 | 62 | 72 | 70 | 74 | 75 | 72 | 57 | 55 | 183 | 79 | 62 | 31 | 18 | 43 | 39 | 29 | 92 | 87 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | off | cross-off | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-off |
High Tide | 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 | 10:23AM0.99m | 10:44PM0.88m | ||||||||
Low Tide | 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 | 4:38PM0.06m | 4:27AM0.03m | |||||||
6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | |
— | 7:30 | — | — | 7:29 | — | — | 7:27 | — | — | 7:25 | — | — | 7:23 | — | — | 7:22 | — | — | 7:21 | — | |
mm | — | — | — | — | — | — | — | — | 2 | 4 | 2 | 1 | — | — | — | — | — | — | — | — | 2 |
Temp °C | 20 | 22 | 23 | 20 | 23 | 23 | 23 | 24 | 24 | 24 | 23 | 24 | 19 | 20 | 21 | 20 | 21 | 22 | 22 | 24 | 26 |
Feels °C | 17 | 18 | 21 | 20 | 21 | 22 | 22 | 23 | 23 | 23 | 23 | 25 | 16 | 19 | 20 | 19 | 19 | 19 | 21 | 23 | 26 |
Swell 1 Height (m) Direction Period (s) | S 6 | SE 6 | SW 5 | SE 9 | SE 8 | SE 8 | SE 8 | SE 9 | SE 8 | SE 8 | SE 8 | S 7 | SSW 7 | SSW 7 | SSW 6 | S 6 | SE 8 | SE 8 | SE 7 | SE 8 | SSW 6 |
17 | 10 | 22 | 62 | 72 | 70 | 74 | 75 | 72 | 57 | 55 | 183 | 79 | 62 | 31 | 18 | 43 | 39 | 17 | 3 | 87 | |
Swell 2 Height (m) Direction Period (s) | ESE 6 | SE 10 | SE 10 | SW 4 | SW 5 | S 6 | — | E 11 | E 11 | E 10 | SW 5 | SE 8 | SE 8 | SE 8 | SE 7 | ESE 6 | SSW 6 | E 8 | S 16 | SE 17 | SE 16 |
8 | 17 | 26 | 5 | 6 | 6 | — | 9 | 2 | 2 | 12 | 55 | 63 | 40 | 31 | 16 | 11 | 1 | 5 | 12 | 41 | |
Swell 3 Height (m) Direction Period (s) | SE 11 | E 6 | ESE 6 | E 6 | S 6 | — | — | — | — | E 10 | S 5 | E 10 | E 9 | E 9 | ENE 4 | SE 8 | E 9 | — | — | SE 17 | SE 16 |
29 | 1 | 3 | 1 | 3 | — | — | — | — | 2 | 12 | 2 | 2 | 2 | 3 | 11 | 2 | — | — | 12 | 41 | |
Wind waves Height (m) Direction Period (s) | W 3 | SW 4 | — | SW 4 | — | SW 4 | SW 6 | SSW 4 | SSW 5 | S 5 | SSW 5 | — | NNE 2 | ENE 3 | — | ENE 3 | — | SSW 4 | SSW 4 | SSW 5 | — |
8 | 24 | — | 7 | — | 4 | 15 | 17 | 51 | 32 | 26 | — | 1 | 3 | — | 1 | — | 11 | 29 | 92 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 159 | 198 | 49 | 24 | 1084 | 131 | 133 | 161 | 152 | 117 | 152 | 0 | 24 | 24 | 24 | 24 | 1084 | 791 | 249 | 183 | 24 |
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.











