Surf Forecasts:
Block Island surf forecast from 11 Aug 2026:
- Best quality surf: Monday 17 Aug, 5PM (local time) - 6ft (1.8m), 8s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 8AM (local time) - 7.5ft (2.3m), 7s period, SSW swell with 527 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 5PM (local time) - 6ft (1.8m), 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 5PM. The primary swell is predicted to be 1.8m and 8s 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 2.3m 7s and forecast to arrive on Monday (Aug 17) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Friday (Aug 14) at 11AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Mon 17th Aug) | 6ft (1.8m) 8s |
| Best Surf | 5PM (Mon 17th Aug) | 6ft (1.8m) 8s |
| Most Powerful | 8AM (Mon 17th Aug) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here.
Let's be honest about Block Island. The next couple of weeks are mostly a rough stretch, but there are a couple of rare windows that might just fire. The water's sitting around 72°, which is dead average for this time of year. Nothing out of the ordinary there.
For the first week, from now through August 16th, it's flat and ugly. Tiny swell, onshore wind, and generally messy. You're looking at waves from knee-high to barely waist-high at best. There's a glassy morning on the 13th, but with a weak 2ft S swell and barely any energy (52), there's just nothing to ride.
Then things change. On Monday, August 17th, the ocean wakes up. By the afternoon, we get a proper 7ft SSW swell with clean cross-offshore wind from the west. That's a solid wave, packing 435 units of energy. That's your standout for the whole forecast. But Block Island is a point break that rarely breaks, so when it does, take note. That size is a bit much for beginners; you'll want to be comfortable out there. And the crowds are often on the island, so you won't be alone.
After that spike, it gets quirky. The 18th shows a 2ft wave but with a very long 15-second period from the SE. That's pure groundswell, pushing 231 units of energy. For a point break, that long period should wrap in beautifully, but it won't have much power behind it. You'll want to catch it clean on the morning of the 19th if you can.
Wednesday the 19th is your next good look. A clean morning with a 3ft SE swell at 11 seconds and light offshore breezes. That's about as clean as it gets around here, and with 215 units of energy, it'll have a bit of push. It won't be as big as the 17th, but the quality could be way better if the wind holds.
After the 19th, the wind turns ugly. The last week is all onshore slop from the SW, choppy and lumpy with no quality. The waves are there, but the wind kills it. By the 22nd it's back to nothing.
So here's the call: your best bet is the afternoon of the 17th of August for size and grunt, or the morning of the 19th for clean, long-period lines. Everything else is a miss.
- Rusty
Short Range ForecastSome drizzle, heaviest during Thu morning. Warm (max 26°C on Tue afternoon, min 22°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 26°C on Fri afternoon, min 17°C on Fri night). Winds increasing (light winds from the NE on Sat afternoon, fresh winds from the SW by Sun afternoon). | ||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | ||||||||||||||
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 5 | SSW 5 | SSW 5 | SSW 6 | SW 5 | SSW 6 | SSW 5 | SSW 5 | S 5 | S 8 | S 8 | S 8 | S 7 | S 7 | S 7 | SSW 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 28 | 25 | 21 | 17 | 17 | 11 | 31 | 57 | 47 | 36 | 24 | 18 | 55 | 92 | 72 | 54 | 37 | 24 | 248 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | off | glassy | cross-on | cross-off | cross | cross-on | cross | cross-off | cross-off | off | off | on | off | cross | cross-on | cross-on |
High Tide | 7:08AM0.90m | 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 | |||||||
Low Tide | 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 | 4:44PM0.02m | 4:52AM0.02m | 5:35PM0.08m | |||||||
 |  |  | | | | |  | |  | | |  | | | | | | | |
 | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — |
 | 7:52 | — | 7:51 | — | — | 7:49 | — | — | 7:47 | — | — | 7:46 | — | — | 7:45 | — | — | 7:44 | — |
mm | — | — | — | — | — | — | — | 1 | — | 1 | — | — | — | — | — | — | — | — | 2 |
Temp °C | 25 | 24 | 26 | 26 | 23 | 25 | 25 | 26 | 23 | 23 | 23 | 26 | 23 | 19 | 22 | 23 | 21 | 23 | 24 |
Feels °C | 24 | 24 | 25 | 25 | 23 | 22 | 23 | 26 | 22 | 24 | 17 | 21 | 17 | 14 | 20 | 21 | 20 | 21 | 20 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | ESE 9 | SSW 5 | SSW 5 | SSW 5 | ESE 8 | SW 5 | ESE 8 | SE 9 | SSW 5 | S 5 | S 8 | S 8 | S 8 | S 7 | S 7 | S 7 | — |
| kJ | 28 | 25 | 8 | 17 | 17 | 11 | 7 | 57 | 7 | 13 | 24 | 18 | 55 | 92 | 72 | 54 | 37 | 24 | — |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 9 | E 8 | SE 9 | SE 8 | ESE 8 | SE 14 | SE 8 | SE 13 | SE 13 | ESE 9 | NE 3 | W 4 | SE 9 | NNE 3 | SE 9 | SE 9 | SE 8 | — |
| kJ | 4 | 3 | 1 | 3 | 3 | 7 | 8 | 3 | 7 | 7 | 8 | 2 | 3 | 3 | 1 | 3 | 3 | 3 | — |
Swell 3 Height (m) Direction Period (s) | E 8 | E 8 | — | E 8 | E 8 | — | SE 11 | SE 10 | E 7 | — | SE 13 | ESE 9 | SE 9 | SE 12 | SE 9 | — | — | — | — |
| kJ | 1 | 1 | — | 1 | 1 | — | 5 | 4 | 1 | — | 7 | 8 | 3 | 6 | 3 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 3 | — | SSW 6 | — | NE 3 | — | SSW 6 | — | SSW 6 | SSW 5 | NNE 3 | — | NNW 3 | N 4 | — | — | — | — | SSW 6 |
| kJ | 6 | — | 21 | — | 2 | — | 31 | — | 47 | 36 | 8 | — | 9 | 6 | — | — | — | — | 248 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 634 | 912 | 2500 | 767 | 769 | 1067 | 691 | 2594 | 1701 | 767 | 749 | 844 | 54 | 24 | 24 | 29 | 642 | 1156 | 1148 |
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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