Surf Forecasts:
Block Island surf forecast from 8 Aug 2026:
- Most powerful swell: Sunday 9 Aug, 5PM (local time) - 4.5ft (1.3m), 7s period, SSW swell with 150 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 1.3m 7s and forecast to arrive on Sunday (Aug 09) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Friday (Aug 14) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Sun 9th Aug) | 4.5ft (1.3m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s look at what’s cookin’ for Block Island over the next couple of weeks.
Alright, I gotta be straight with you – the first week and a half is a tough one. We’ve got a long stretch of poor surf conditions from now until Friday, August 21st. The waves are small, the wind is mostly cross or onshore, and there’s just no energy in the water. The swell is tiny, the period is short, and it’s gonna be frustrating. The combined wave energy is weak, sitting around 90 to 150 (moderate at best), so you’re not missing much. It’s a real bummer, but it happens.
Now, things start to look a little more interesting on Friday, August 21st. The morning at Block Island shows a bit of hope with a clean, cross-off breeze and a small swell from the SE. The combined energy kicks up to 165 (moderate). It’s still small, but it’s surfable. The real stand-out, though, is the morning of Saturday, August 22nd. The wind is glassy, dead calm, and the swell is a clean 3 ft from the SE with a period of 12 seconds. That’s a proper groundswell, and the combined energy is 234 (strong). The waves will be clean, glassy, and have some juice. This is the best on offer – a true window of clean, lined-up surf. Get on it, because the onshore winds ruin it by the afternoon.
The following Sunday, August 23rd, brings a bigger swell at 7 ft from the S, but it’s a short period and the wind is messy. That one’s for the experts only, and even then, the quality is poor.
So, the highlight is the morning of Saturday, August 22nd. That’s your moment. Everything else is a wait-and-see. The water’s about average for this time of year, nothing crazy.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri night. Warm (max 29°C on Sun afternoon, min 22°C on Mon morning). Winds decreasing (fresh winds from the SW on Sun afternoon, light winds from the NNE by Mon morning). | Days 5-7 Weather SummaryModerate rain (total 19mm), heaviest on Tue night. Warm (max 26°C on Mon night, min 21°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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 5 | SSW 6 | SSW 6 | SSW 6 | SSW 7 | SSW 7 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 5 | SSW 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 41 | 57 | 87 | 124 | 125 | 150 | 73 | 36 | 25 | 52 | 55 | 51 | 49 | 38 | 37 | 34 | 25 | 25 | 22 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross | cross | cross | cross-off | cross-on | cross-on | cross | cross | cross-on | cross-off | cross-off | cross-off | off | glassy | cross-off | cross-off |
High Tide | 3:52AM0.71m | 4:35PM1.00m | 5:04AM0.75m | 5:43PM1.04m | 6:10AM0.82m | 6:44PM1.08m | 7:08AM0.90m | 7:37PM1.09m | 8:02AM0.97m | 8:27PM1.09m | 8:53AM1.03m | 9:14PM1.05m | |||||||
Low Tide | 10:36PM0.14m | 9:31AM0.06m | 11:40PM0.10m | 10:49AM0.03m | 00:36AM0.05m | 12:02PM-0.01m | 1:27AM0.00m | 1:07PM-0.05m | 2:13AM-0.03m | 2:05PM-0.06m | 2:57AM-0.05m | 3:00PM-0.05m | 3:38AM-0.05m | ||||||
 |  | |  | | |  | | | | |  | |  | | | | | | |
 | — | 5:48 | — | — | 5:48 | — | — | 5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — |
 | 7:55 | — | 7:54 | — | — | 7:52 | — | — | 7:52 | — | — | 7:51 | — | — | 7:49 | — | — | 7:47 | — |
mm | 4 | — | — | — | — | — | — | — | — | — | — | 1 | 18 | — | — | — | — | — | — |
Temp °C | 28 | 24 | 28 | 27 | 26 | 29 | 29 | 23 | 26 | 26 | 25 | 25 | 23 | 23 | 26 | 25 | 22 | 23 | 20 |
Feels °C | 29 | 27 | 26 | 28 | 26 | 26 | 28 | 24 | 24 | 26 | 25 | 26 | 25 | 24 | 24 | 23 | 23 | 22 | 19 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | SE 8 | SSW 7 | ESE 8 | SSW 6 | SSW 6 | SSW 6 | SE 10 | SSW 6 | SE 9 | SSW 6 | SSW 6 | SE 8 | SSW 6 | SSW 6 | SE 8 | SSW 6 |
| kJ | 23 | 34 | 16 | 9 | 125 | 6 | 73 | 36 | 25 | 4 | 55 | 3 | 49 | 38 | 3 | 34 | 25 | 3 | 22 |
Swell 2 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 9 | SE 7 | — | SE 10 | SE 10 | SE 10 | E 8 | SE 9 | E 8 | ESE 9 | ESE 8 | E 8 | SE 8 | SE 8 | SE 10 | SE 9 |
| kJ | 1 | 1 | 2 | 2 | 8 | — | 4 | 4 | 4 | 1 | 3 | 1 | 7 | 7 | 1 | 3 | 3 | 4 | 13 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | E 8 | E 8 | E 8 | — | E 8 | — | E 7 | SE 15 | S 14 | SE 14 | SE 10 | — | SE 13 |
| kJ | — | — | — | — | — | — | 1 | 1 | 1 | — | 1 | — | 1 | 8 | 4 | 8 | 4 | — | 7 |
Wind waves Height (m) Direction Period (s) | SSW 5 | SSW 6 | SSW 6 | SSW 6 | — | SSW 7 | — | — | — | SSW 6 | — | SSW 5 | — | — | SSW 6 | — | NNE 3 | SSW 5 | NNW 4 |
| kJ | 41 | 57 | 87 | 124 | — | 150 | — | — | — | 52 | — | 51 | — | — | 37 | — | 3 | 25 | 13 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 29 | 24 | 226 | 24 | 24 | 219 | 24 | 775 | 642 | 29 | 29 | 2500 | 24 | 49 | 81 | 49 | 642 | 2556 | 702 |
Best forecast wave conditions in Rhode Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Block Island surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest