Surf Forecasts:
Block Island surf forecast from 13 Aug 2026:
- Best quality surf: Monday 17 Aug, 11AM (local time) - 4.5ft (1.4m), 7s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 5AM (local time) - 7ft (2.2m), 7s period, SW swell with 507 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 11AM (local time) - 4.5ft (1.4m), 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 Monday (Aug 17) at 11AM. The primary swell is predicted to be 1.4m 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 2.2m 7s and forecast to arrive on Monday (Aug 17) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Aug 15) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 17th Aug) | 4.5ft (1.4m) 7s |
| Best Surf | 11AM (Mon 17th Aug) | 4.5ft (1.4m) 7s |
| Most Powerful | 5AM (Mon 17th Aug) | 7ft (2.2m) 7s |
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 offer for Block Island.
Straight up, I gotta be honest with you – this outlook is a tough one. We’re looking at a real long stretch of not much to get excited about. For the first nine days, from Thursday the 13th of August all the way through to Friday the 21st of August, the surf is just poor. It’s a real flat spell with messy wind. Don’t bother paddling out unless you just want to sit on the water.
Things start to show a tiny pulse of life around the 22nd of August. Saturday morning sees a bit of a bump in swell, but it’s not exactly clean. We’ve got a 5ft swell coming from the south with a short period of 6 seconds, and the combined energy is moderate at 194. The wind is glassy though – that’s a major positive. For a moment there, it’s clean. But it’s short-lived because the afternoon brings onshore wind and messes it up. Still, that Saturday morning window is the best we get.
Block Island is a point break that rarely breaks, so this is one of those times. It’s exposed to the swell and the optimum direction is from the southeast. The little pulse we get on the 22nd is from the south, so it’s not a perfect match, but with the glassy conditions, it’s worth a look if you’re desperate. Crowds are often an issue here, so expect company.
The second week is a write-off. From Sunday the 23rd onward, the swell drops back to tiny, the wind is onshore or cross-shore, and the energy is weak. There’s a morning on the 28th of August with a clean 4ft east swell and a period of 8 seconds, combined energy at 152, but it’s a long way off and the forecast is less certain. For now, it’s a slim hope.
Bottom line: Saturday morning, the 22nd of August, is your only real chance. Get it while it’s glassy because it won’t last.
- Rusty
Short Range ForecastModerate rain (total 14mm), heaviest on Fri night. Warm (max 27°C on Thu afternoon, min 18°C on Fri night). Winds increasing (calm on Wed night, fresh winds from the NNE by Fri night). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Sun night. Warm (max 26°C on Mon afternoon, min 21°C on Sat night). Winds decreasing (strong winds from the SSW on Sun night, calm by Mon night). | ||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 | SW 4 | SW 5 | SSW 5 | ESE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | S 6 | SSW 6 | SSW 5 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | S 6 | SE 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 9 | 22 | 43 | 18 | 8 | 13 | 8 | 8 | 8 | 21 | 32 | 72 | 384 | 181 | 172 | 89 | 45 | 39 | 69 |
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-off | cross-off | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross | glassy | cross-off | cross-on | cross-on |
High Tide | 8:27PM1.09m | 8:53AM1.03m | 9:14PM1.05m | 9:42AM1.05m | 9:59PM0.99m | 10:29AM1.05m | 10:44PM0.92m | 11:16AM1.01m | 11:28PM0.84m | 12:04PM0.96m | 00:13AM0.76m | 12:54PM0.90m | 1:02AM0.69m | ||||||
Low Tide | 2:57AM-0.05m | 3:00PM-0.05m | 3:38AM-0.05m | 3:53PM-0.02m | 4:17AM-0.03m | 4:44PM0.02m | 4:52AM0.02m | 5:35PM0.08m | 5:24AM0.07m | 6:30PM0.15m | 5:54AM0.13m | 7:31PM0.20m | |||||||
 |  | |  |  | | | | | | |  | |  | |  | | | | |
 | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — |
 | 7:49 | — | 7:47 | — | — | 7:46 | — | — | 7:45 | — | — | 7:44 | — | — | 7:42 | — | — | 7:40 | — |
mm | 1 | 4 | 1 | — | — | — | 8 | — | — | — | — | — | 4 | — | — | — | — | — | — |
Temp °C | 25 | 23 | 27 | 27 | 23 | 25 | 25 | 19 | 21 | 21 | 22 | 22 | 24 | 23 | 26 | 26 | 23 | 24 | 23 |
Feels °C | 23 | 24 | 26 | 24 | 22 | 22 | 22 | 16 | 20 | 19 | 19 | 18 | 22 | 24 | 26 | 27 | 24 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SE 8 | SE 8 | SSW 5 | SSW 5 | SE 9 | ESE 9 | ENE 4 | NE 4 | ESE 9 | SE 9 | SSE 8 | — | SSW 7 | SSW 7 | SSW 7 | SSW 7 | S 6 | SE 12 |
| kJ | 6 | 3 | 3 | 18 | 5 | 13 | 8 | 2 | 3 | 8 | 12 | 7 | — | 181 | 172 | 89 | 45 | 39 | 69 |
Swell 2 Height (m) Direction Period (s) | ESE 8 | SE 10 | SE 10 | ESE 9 | ESE 9 | SE 13 | SSW 4 | ESE 9 | ESE 9 | — | — | — | — | — | — | SE 8 | SE 9 | SE 9 | — |
| kJ | 7 | 4 | 4 | 8 | 8 | 7 | 2 | 8 | 8 | — | — | — | — | — | — | 11 | 13 | 20 | — |
Swell 3 Height (m) Direction Period (s) | SE 14 | SE 14 | SE 13 | SE 13 | — | — | S 5 | S 6 | S 7 | SE 6 | — | — | — | — | — | S 15 | SSE 14 | SSE 13 | — |
| kJ | 8 | 7 | 7 | 7 | — | — | 2 | 2 | 1 | 1 | — | — | — | — | — | 4 | 18 | 17 | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | SW 5 | NW 4 | NNW 3 | SW 5 | NNE 4 | N 4 | — | S 6 | SSW 6 | SSW 5 | SSW 7 | NW 3 | — | — | NE 3 | E 3 | S 6 |
| kJ | 9 | 22 | 43 | 10 | 4 | 8 | 25 | 6 | — | 21 | 32 | 72 | 384 | 5 | — | — | 3 | 1 | 35 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 642 | 767 | 102 | 2381 | 1008 | 3423 | 769 | 1687 | 3373 | 1682 | 702 | 1700 | 26 | 0 | 24 | 24 | 25 | 397 | 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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