Surf Forecasts:
Block Island surf forecast from 15 Aug 2026:
- Best quality surf: Monday 17 Aug, 5PM (local time) - 6ft (1.9m), 7s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 5PM (local time) - 6ft (1.9m), 7s period, S swell with 326 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 5PM (local time) - 6ft (1.9m), 7s 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 Monday (Aug 17) at 5PM. The primary swell is predicted to be 1.9m and 7s period. 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 1.9m 7s and forecast to arrive on Monday (Aug 17) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Thursday (Aug 20) at 5PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Mon 17th Aug) | 6ft (1.9m) 7s |
| Best Surf | 5PM (Mon 17th Aug) | 6ft (1.9m) 7s |
| Most Powerful | 5PM (Mon 17th Aug) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, let’s get into it. We’ve got a long stretch of quiet water ahead, and honestly, it’s a bit of a tough pill to swallow. For the first stretch, we’re looking at a lot of small, messy, and just plain poor surf. The energy’s weak, and the wind’s all over the place. You’ll see nothing rideable until Monday the 17th, and even then, it’s a scratchy 6ft on a short period. It’s not going to be pretty, but it’s something.
The low point is the weekend of the 15th and 16th. Tiny waves, under 2ft, with light cross-onshore winds. You’d be lying to yourself if you paddled out. Real flat spell. Then, Monday the 17th arrives with a bump in size, but the wind is howling onshore in the morning with rain. Not good. The afternoon cleans up a bit with a cross-offshore wind and there might be a few lumpy ones, but it’s still short-period and won't hold any proper shape. That whole first week until the 21st is just locked in that pattern of small, junky surf.
We get a couple of days with cleaner conditions, like Tuesday the 18th morning, but the swell is still just around 4ft and not doing much. Honestly, the standout from this whole 16-day outlook is way out there – Thursday morning, the 27th of August. The wind goes glassy, and while the swell isn't massive at 3ft, that long 12-second period from the SE will make it feel so much fuller than the numbers suggest. The energy reading is solid, and with the glassy conditions, it’s going to be your best chance for a genuinely clean session. That’s the one to circle, but understand it’s a long way off, so treat it as promising rather than a sure thing.
Everything else after that is just more of the same – small swells, cross-onshore breezes kicking up chop. The water temp is about 71°, which is pretty normal for the time of year, so you won't need the full winter gear just yet. But seriously, for the next two weeks, don't get your hopes up. This looks more like a time to work on the board repair than get barreled. There will be a few windows, especially around that 27th, but otherwise, keep expectations low.
Rusty
Short Range ForecastModerate rain (total 11mm), heaviest on Mon morning. Warm (max 24°C on Mon afternoon, min 20°C on Sun morning). Winds increasing (light winds from the SSW on Sun morning, strong winds from the SSE by Mon morning). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Thu morning. Warm (max 25°C on Wed afternoon, min 20°C on Thu morning). Wind will be generally light. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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) | SSE 6 | ESE 9 | SE 9 | S 6 | SSW 4 | S 6 | S 7 | S 7 | SSE 8 | SSE 7 | SSW 7 | SE 6 | SE 6 | SE 6 | SE 7 | SE 8 | E 5 | ENE 5 | ENE 5 | SE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 4 | 8 | 12 | 18 | 21 | 197 | 326 | 233 | 158 | 114 | 41 | 51 | 41 | 24 | 16 | 18 | 53 | 55 | 48 | 20 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross-on | on | cross-off | off | cross-off | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross | on | cross | cross-on | cross |
High Tide | 10:44PM0.92m | 11:16AM1.01m | 11:28PM0.84m | 12:04PM0.96m | 00:13AM0.76m | 12:54PM0.90m | 1:02AM0.69m | 1:51PM0.84m | 1:59AM0.63m | 2:56PM0.80m | 3:09AM0.60m | 4:02PM0.79m | 4:20AM0.60m | |||||||
Low Tide | 4:44PM0.02m | 4:52AM0.02m | 5:35PM0.08m | 5:24AM0.07m | 6:30PM0.15m | 5:54AM0.13m | 7:31PM0.20m | 6:30AM0.19m | 8:37PM0.25m | 7:19AM0.23m | 9:43PM0.27m | 8:42AM0.25m | 10:43PM0.26m | |||||||
 |  |  | |  |  |  | | | | | | |  | | | |  |  | | |
 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — |
 | 7:45 | — | — | 7:44 | — | — | 7:42 | — | — | 7:40 | — | — | 7:39 | — | — | 7:37 | — | — | 7:37 | — |
mm | — | — | — | — | 2 | 7 | 2 | — | — | — | — | — | — | 1 | 2 | — | — | — | 4 | 4 |
Temp °C | 22 | 23 | 21 | 23 | 23 | 22 | 24 | 24 | 22 | 23 | 23 | 24 | 25 | 25 | 21 | 24 | 24 | 21 | 21 | 19 |
Feels °C | 20 | 20 | 21 | 20 | 21 | 18 | 26 | 25 | 22 | 25 | 24 | 25 | 25 | 24 | 22 | 25 | 24 | 21 | 20 | 15 |
Swell 1 Height (m) Direction Period (s) | SSE 6 | ESE 9 | S 6 | SE 8 | SE 8 | — | — | S 7 | SSE 8 | SSE 7 | SSW 7 | SE 6 | SE 6 | SE 6 | SSW 5 | SSW 5 | SE 8 | SE 8 | SSW 6 | ENE 5 |
| kJ | 4 | 8 | 7 | 11 | 11 | — | — | 233 | 158 | 114 | 41 | 51 | 41 | 24 | 10 | 5 | 11 | 11 | 10 | 20 |
Swell 2 Height (m) Direction Period (s) | SE 9 | S 5 | SE 9 | SE 6 | — | — | — | S 14 | SSW 7 | SSW 7 | SE 6 | SSW 6 | SSE 9 | SW 4 | SE 7 | SE 8 | S 5 | S 5 | SE 8 | SE 8 |
| kJ | 3 | 2 | 12 | 2 | — | — | — | 4 | 55 | 36 | 33 | 15 | 8 | 7 | 16 | 18 | 2 | 2 | 17 | 16 |
Swell 3 Height (m) Direction Period (s) | S 6 | S 6 | — | — | — | — | — | — | S 13 | SE 12 | SE 8 | — | — | SE 9 | SE 9 | SE 9 | SW 5 | SE 15 | SE 14 | SSW 6 |
| kJ | 2 | 3 | — | — | — | — | — | — | 3 | 6 | 23 | — | — | 13 | 12 | 12 | 1 | 8 | 8 | 6 |
Wind waves Height (m) Direction Period (s) | — | SW 2 | — | S 6 | SSW 4 | S 6 | S 7 | — | — | — | — | — | SSW 6 | — | NE 4 | ENE 4 | E 5 | ENE 5 | ENE 5 | ENE 5 |
| kJ | — | 2 | — | 18 | 21 | 197 | 326 | — | — | — | — | — | 15 | — | 10 | 37 | 53 | 55 | 48 | 33 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 3426 | 1687 | 1156 | 1541 | 912 | 99 | 0 | 0 | 0 | 24 | 24 | 24 | 1084 | 141 | 49 | 24 | 24 | 415 | 198 | 249 |
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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