Surf Forecasts:
Block Island surf forecast from 9 Aug 2026:
- Most powerful swell: Thursday 13 Aug, 5PM (local time) - 4.5ft (1.4m), 5s period, WSW swell with 109 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 1.4m 5s and forecast to arrive on Thursday (Aug 13) 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 0.9m 6s period and expected on Thursday (Aug 13) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Thu 13th Aug) | 4.5ft (1.4m) 5s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's talk Block Island. The numbers are in, and it’s a tough 16-day stretch. This spot is a point break that rarely breaks, so a long dry spell is part of the deal here. For the first 12 days, the surf is practically non-existent. The wave energy is weak, with readings under 100, and the swell period is a short, weak 6 to 8 seconds. Not enough to get the point going.
The only real standout is on Thursday, August 20th, in the morning. A 10ft swell from the SSW arrives with a period of 8 seconds. The combined energy hits 1416, which is very strong. The wind is from the NW at 16 mph, giving a clean cross-offshore breeze. That’s a massive amount of water for a spot that rarely breaks, and with clean wind, it could be incredible. But at 10ft, this is strictly for experts. The water temp is about 71°F, which is average for the time of year.
After that morning peak, the swell drops to 4ft in the afternoon, and the data shows "poor surf conditions" for the rest of the window. The 20th morning is the one true standout – a big, clean, very powerful point break. It’s a rare event, but it’s a doozy.
Saturday, August 15th morning offers a second option with a 4ft S swell and 8-second period, plus a clean cross-offshore wind from the W at 9 mph. The combined energy is 164, which is moderate. That’s your best bet for something smaller and cleaner, but it's still short-period and small.
So, the call is: the 20th of August morning is the big one, but it’s a beast. The 15th morning is a smaller, much cleaner alternative. The rest of the 16 days is a bust.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Sun afternoon, min 23°C on Mon morning). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Tue night. Warm (max 27°C on Tue night, min 18°C on Thu night). Winds increasing (light winds from the W on Tue night, fresh winds from the WSW by Fri afternoon). | ||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | S 5 | S 6 | SSW 6 | SSW 6 | SSW 6 | S 6 | S 6 | SSW 5 | SW 6 | WSW 5 | SSW 6 | S 7 | S 7 | S 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 84 | 73 | 82 | 49 | 25 | 20 | 19 | 49 | 41 | 40 | 17 | 15 | 52 | 89 | 109 | 33 | 40 | 52 | 82 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | off | cross | cross-on | cross-off | cross-off | cross | cross-on | cross-off | cross-off | on | cross-off | cross-off | off | cross-off | cross | cross-off |
High Tide | 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 | 9:42AM1.05m | 9:59PM0.99m | |||||||
Low Tide | 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 | 3:53PM-0.02m | 4:17AM-0.03m | ||||||
 |  | | | |  | | | |  |  | | |  | | | | | | |
 | — | 5:48 | — | — | 5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — |
 | 7:54 | — | 7:52 | — | — | 7:52 | — | — | 7:51 | — | — | 7:49 | — | — | 7:47 | — | — | 7:46 | — |
mm | — | — | — | — | — | — | — | — | — | 6 | 4 | — | 1 | 3 | — | — | — | — | — |
Temp °C | 27 | 26 | 29 | 28 | 24 | 26 | 27 | 26 | 27 | 27 | 22 | 21 | 21 | 23 | 26 | 26 | 20 | 23 | 23 |
Feels °C | 27 | 26 | 27 | 27 | 24 | 26 | 26 | 25 | 24 | 26 | 24 | 20 | 20 | 25 | 23 | 24 | 15 | 17 | 19 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SE 7 | SSW 6 | SSW 6 | S 5 | S 6 | SSW 6 | ESE 9 | SSW 6 | S 6 | S 6 | SE 8 | SE 8 | SE 8 | SSW 6 | S 7 | S 7 | S 8 |
| kJ | 84 | 73 | 2 | 49 | 25 | 20 | 19 | 49 | 8 | 40 | 17 | 15 | 3 | 11 | 3 | 33 | 40 | 52 | 82 |
Swell 2 Height (m) Direction Period (s) | SE 7 | E 8 | E 8 | SE 7 | SE 10 | SE 10 | SE 10 | SE 9 | E 8 | SE 9 | SE 8 | SE 8 | SE 14 | SE 14 | SE 10 | SE 9 | ESE 10 | ESE 9 | ESE 9 |
| kJ | 14 | 1 | 1 | 2 | 4 | 4 | 4 | 3 | 1 | 3 | 3 | 3 | 8 | 7 | 4 | 13 | 9 | 8 | 8 |
Swell 3 Height (m) Direction Period (s) | E 9 | — | — | SE 10 | E 8 | E 8 | E 8 | E 8 | — | E 8 | E 8 | S 14 | SE 11 | E 7 | SE 13 | SE 13 | SE 13 | SE 13 | S 12 |
| kJ | 2 | — | — | 4 | 1 | 1 | 1 | 1 | — | 1 | 1 | 4 | 5 | 1 | 7 | 7 | 7 | 7 | 3 |
Wind waves Height (m) Direction Period (s) | — | — | SSW 6 | — | — | — | SW 4 | — | SSW 6 | NNW 3 | — | — | SSW 5 | SW 6 | WSW 5 | NW 4 | NW 3 | WSW 3 | NW 3 |
| kJ | — | — | 82 | — | — | — | 8 | — | 41 | 1 | — | — | 52 | 89 | 109 | 10 | 2 | 9 | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 219 | 25 | 24 | 219 | 24 | 445 | 230 | 26 | 49 | 2500 | 274 | 49 | 642 | 308 | 769 | 280 | 49 | 26 | 26 |
Best forecast wave conditions in Rhode Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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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.
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