
Surf Forecasts:
Block Island surf forecast from 12 Aug 2026:
- Best quality surf: Monday 17 Aug, 11AM (local time) - 5ft (1.6m), 8s period, SSW swell with offshore winds.
- Most powerful swell: Monday 17 Aug, 5AM (local time) - 7ft (2.2m), 8s period, SSW swell with 572 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 11AM (local time) - 5ft (1.6m), 8s 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 1.6m and 8s 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 8s 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 0.7m 4s period and expected on Saturday (Aug 15) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 17th Aug) | 5ft (1.6m) 8s |
| Best Surf | 11AM (Mon 17th Aug) | 5ft (1.6m) 8s |
| Most Powerful | 5AM (Mon 17th Aug) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here. Let's get into it.
First up, we're looking at Block Island. This spot is a point break that rarely breaks and when it does, it's an intermediate level wave. The crowds can be a factor here, as they are "often" around. For the next week, it's a pretty grim picture. We've got a long run of days from now through to the 16th of August with nothing surfable. Small, weak, and messy conditions dominate with combined swell energy figures in the low teens to around 100 (between 21 and 104). The winds are mostly cross or cross-onshore, creating choppy, poor quality surf. It's not looking good at all. There is a glimmer of hope on the horizon.
The standout window opens up on Monday the 17th of August. The morning sees a NNW offshore wind at 9 mph, which is a major positive. We've got a 5 ft SSW groundswell with an 8-second period, and the combined energy jumps to a moderate 303. This is the best call of the whole outlook. The afternoon holds up with a 4 ft SSW swell, and while it's cross-offshore, it remains clean. This is biggest and best-conditioned surf we’ll see.
After that small burst, it drops off again. Tuesday the 18th morning has glassy 2 ft waves but with a tiny combined energy of just 70 – barely a ripple. Then we head into a long, extended run of poor conditions. From the 18th through to the 27th, the story is the same: small swells, mostly onshore winds, and combined energy figures that rarely get above 100, the exceptions being some moderate energy in the 100-200 range but with poor winds. The 22nd has some bigger 7 ft swell, but it's a messy cross-onshore wind, making it a write-off. A few days in the second week offer glassy conditions on the 25th and 26th afternoons, but with swells of only 1 ft to 2 ft and combined energy in the 40s, there's just no power. This area goes through blank runs like this, it's normal.
So, for my money, the only window worth paddling out for is the Monday the 17th of August. Lock it in.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Tue night, min 20°C on Thu morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Fri night. Warm (max 26°C on Mon afternoon, min 17°C on Fri night). Winds increasing (calm on Sat afternoon, near gales from the SW by Sun night). | ||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 6 | SSW 5 | SSW 5 | SSW 6 | SW 4 | SSW 6 | SE 9 | SE 9 | SE 9 | S 6 | S 6 | S 6 | S 7 | S 7 | SSW 5 | SSW 7 | SSW 8 | SSW 8 | SSW 7 |
Wave Graph | |||||||||||||||||||
25 | 15 | 10 | 12 | 16 | 20 | 13 | 13 | 15 | 12 | 12 | 11 | 23 | 24 | 104 | 565 | 303 | 176 | 79 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross | cross-on | cross-off | cross | cross | off | cross | on | cross-off | cross-off | cross-on | cross | cross-on | cross-on | cross-off | off | cross-off | cross-off |
High Tide | 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 | 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 | |||||||
— | 5:52 | — | — | 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 | — | — | — | — | — | — | — | — | — | 4 | — | — | — | — | — | 5 | — | — | — |
Temp °C | 26 | 23 | 25 | 25 | 21 | 22 | 25 | 22 | 24 | 18 | 20 | 22 | 22 | 23 | 23 | 24 | 23 | 26 | 26 |
Feels °C | 25 | 23 | 23 | 23 | 22 | 23 | 24 | 21 | 22 | 15 | 16 | 21 | 19 | 20 | 19 | 18 | 23 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SSW 5 | ESE 8 | ESE 8 | SSW 5 | WSW 5 | SSW 5 | SSW 5 | SE 9 | S 6 | NE 4 | S 6 | S 7 | S 7 | — | — | SSW 8 | SSW 8 | SSW 7 |
25 | 15 | 7 | 7 | 6 | 2 | 10 | 5 | 13 | 12 | 7 | 11 | 23 | 24 | — | — | 303 | 176 | 79 | |
Swell 2 Height (m) Direction Period (s) | ESE 9 | ESE 8 | — | SE 14 | SE 8 | SE 8 | SE 9 | SE 9 | SE 13 | ESE 9 | S 6 | ENE 4 | SE 9 | ESE 9 | — | — | — | — | NE 4 |
7 | 7 | — | 8 | 3 | 3 | 13 | 13 | 7 | 8 | 12 | 1 | 3 | 8 | — | — | — | — | 4 | |
Swell 3 Height (m) Direction Period (s) | E 8 | E 8 | S 14 | SE 11 | SE 10 | SE 10 | SE 13 | NNE 3 | — | S 12 | SE 9 | SE 9 | — | — | — | — | — | — | SSE 9 |
1 | 1 | 4 | 5 | 4 | 4 | 7 | 1 | — | 3 | 3 | 3 | — | — | — | — | — | — | 8 | |
Wind waves Height (m) Direction Period (s) | — | NNE 2 | SSW 5 | SSW 6 | SW 4 | SSW 6 | N 3 | — | SSW 5 | N 3 | — | — | SW 3 | SW 3 | SSW 5 | SSW 7 | N 4 | NNE 4 | — |
— | 1 | 10 | 12 | 16 | 20 | 3 | — | 15 | 5 | — | — | 3 | 6 | 104 | 565 | 10 | 5 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 25 | 1696 | 1505 | 642 | 99 | 2567 | 691 | 791 | 702 | 847 | 1024 | 3336 | 769 | 1541 | 1541 | 40 | 0 | 0 | 24 |
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
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.











