Surf Forecasts:
Block Island surf forecast from 11 Aug 2026:
- Best quality surf: Monday 17 Aug, 11AM (local time) - 5.5ft (1.7m), 7s period, SSW swell with offshore winds.
- Most powerful swell: Monday 17 Aug, 5AM (local time) - 7ft (2.2m), 7s period, SSW swell with 490 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 11AM (local time) - 5.5ft (1.7m), 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 1.7m and 7s period. 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 2.2m 7s and forecast to arrive on Monday (Aug 17) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 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) | 5.5ft (1.7m) 7s |
| Best Surf | 11AM (Mon 17th Aug) | 5.5ft (1.7m) 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
Hey, Rusty here. Let me level with you – the outlook for Block Island over the next 16 days is a pretty grim stretch. We've got a long, long gap of poor conditions before anything remotely worth paddling out for shows up.
Right now and for a solid week, it’s all weak and messy. Starting from Tuesday, August 11th, and running right through to Saturday, August 16th, the surf is a write-off. Swell heights are tiny, mostly between 1ft and 3ft, coming from the SSW or S, with periods a short and weak 4 to 8 seconds. The combined swell energy is low, barely hitting triple digits (with values from 21 to 83), meaning there’s just no power in the water. The wind is all over the place – cross, cross-on, and onshore – keeping things choppy and bumpy. Basically, it’s a solid six days of nothing.
Finally, a glimmer of hope arrives on Monday, August 17th. Monday morning, we see a pulse of northwest wind swinging offshore and clean, hitting a swell from the SSW at 6ft with a period of 7 seconds. The combined energy jumps to 314 – that's a real number, the only one with three digits in the whole stretch, showing a solid surge of power. This is the standout. But listen, that 6ft from the SSW? At a spot like Block Island, a point break that's exposed to the south-east, that much energy will be working. It's an intermediate-level wave at a break that rarely breaks, so keep that in mind. The offshore wind will clean it right up, but you can bet the crowd will be around – it's a spot that's 'often' busy.
After that Monday morning window, it falls apart again. Monday afternoon turns cross-shore and choppy, and from Tuesday, August 18th onward, we're back into poor, marginal, or onshore junk. There’s a brief moment on Monday morning, August 24th, where we see clean, offshore winds again on a 4ft S swell (energy 187), but it’s only rated as ‘surfable but ordinary’. And Tuesday morning, August 25th, offers a clean, offshore 4ft swell (energy 177), again just ‘surfable’. Nothing to get excited about.
Water temps? Right now it’s sitting at 71°, which is pretty much normal for this time of year, so don’t worry about a wetsuit.
Forget the second week. After the 17th, it’s mostly small, weak, and wind-affected until the very end. Not a classic summer run for this part of the world. Sometimes it stays flat and ugly for a while, and this is one of those times.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Thu night. Warm (max 27°C on Tue night, min 22°C on Tue night). Winds increasing (light winds from the E on Wed morning, strong winds from the SW by Thu afternoon). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun night. Warm (max 26°C on Fri afternoon, min 18°C on Fri night). Winds increasing (calm on Sun morning, strong winds from the SW by Sun night). | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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) | SSW 6 | SW 6 | SSW 5 | SSW 5 | SSW 5 | SW 4 | SW 5 | SSW 5 | SSW 6 | SSW 5 | S 5 | S 6 | S 8 | S 8 | S 7 | SSW 7 | SSW 4 | SSW 7 | SSW 7 | SSW 7 | S 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 28 | 32 | 26 | 15 | 10 | 10 | 29 | 47 | 63 | 21 | 13 | 20 | 80 | 74 | 38 | 37 | 26 | 476 | 314 | 228 | 127 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | off | cross-on | cross-on | cross-off | cross-on | cross | cross | off | cross-off | off | off | cross | off | cross-on | cross-on | cross-on | off | cross | cross-off |
High Tide | 7:37PM1.09m | 8:02AM0.97m | 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 | ||||||||
Low Tide | 1:07PM-0.05m | 2:13AM-0.03m | 2:05PM-0.06m | 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 | ||||||||
 |  |  | | |  | |  |  | | | | | | | |  |  | | | | |
 | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — |
 | — | 7:51 | — | — | 7:49 | — | — | 7:47 | — | — | 7:46 | — | — | 7:45 | — | — | 7:44 | — | — | 7:42 | — |
mm | — | — | — | — | — | — | — | 1 | 2 | — | — | — | — | — | — | — | — | 2 | 4 | — | — |
Temp °C | 24 | 26 | 27 | 23 | 24 | 24 | 24 | 25 | 25 | 21 | 26 | 24 | 21 | 24 | 25 | 21 | 23 | 23 | 24 | 21 | 22 |
Feels °C | 24 | 26 | 27 | 23 | 23 | 23 | 24 | 24 | 24 | 17 | 22 | 18 | 18 | 21 | 22 | 20 | 21 | 18 | 23 | 19 | 20 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | ESE 9 | SSW 5 | SSW 5 | SSW 5 | ESE 8 | SE 8 | SE 10 | SSW 6 | SSW 5 | S 5 | S 6 | S 8 | S 8 | S 7 | SSW 7 | SE 9 | — | SSW 7 | SSW 7 | S 7 |
| kJ | 28 | 8 | 26 | 15 | 10 | 7 | 3 | 4 | 63 | 21 | 13 | 20 | 80 | 74 | 38 | 37 | 3 | — | 314 | 228 | 127 |
Swell 2 Height (m) Direction Period (s) | SE 9 | E 8 | SE 9 | ESE 8 | ESE 8 | SE 14 | SE 10 | SE 8 | ESE 9 | ESE 9 | ESE 9 | SSE 7 | NNE 4 | SE 9 | SE 9 | SE 9 | — | — | — | — | SSE 10 |
| kJ | 3 | 1 | 3 | 7 | 7 | 8 | 4 | 3 | 8 | 8 | 8 | 15 | 4 | 3 | 3 | 3 | — | — | — | — | 9 |
Swell 3 Height (m) Direction Period (s) | E 8 | — | E 8 | E 8 | S 14 | SE 11 | SE 14 | SE 13 | SE 13 | SE 13 | SE 13 | SE 9 | SE 9 | — | — | — | — | — | — | — | SE 18 |
| kJ | 1 | — | 1 | 1 | 4 | 5 | 7 | 7 | 7 | 7 | 7 | 3 | 3 | — | — | — | — | — | — | — | 12 |
Wind waves Height (m) Direction Period (s) | NNW 3 | SW 6 | NNW 2 | — | — | SW 4 | SW 5 | SSW 5 | — | NNW 3 | W 3 | N 4 | N 4 | — | WSW 4 | W 3 | SSW 4 | SSW 7 | — | N 2 | NE 4 |
| kJ | 1 | 32 | 1 | — | — | 10 | 29 | 47 | — | 2 | 2 | 18 | 7 | — | 13 | 1 | 26 | 476 | — | 1 | 10 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 767 | 2500 | 767 | 1696 | 1067 | 642 | 767 | 3363 | 24 | 2565 | 743 | 634 | 85 | 24 | 85 | 642 | 1158 | 670 | 0 | 25 | 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.
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