Surf Forecasts:
Block Island surf forecast from 11 Aug 2026:
- Best quality surf: Monday 17 Aug, 2PM (local time) - 6ft (1.9m), 7s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 11AM (local time) - 7ft (2.1m), 7s period, SSW swell with 437 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 2PM (local time) - 6ft (1.9m), 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 2PM. The primary swell is predicted to be 1.9m and 7s 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 2.1m 7s and forecast to arrive on Monday (Aug 17) at 11AM. 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 4s period and expected on Friday (Aug 14) at 11PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Mon 17th Aug) | 6ft (1.9m) 7s |
| Best Surf | 2PM (Mon 17th Aug) | 6ft (1.9m) 7s |
| Most Powerful | 11AM (Mon 17th Aug) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s break down what’s in the water around Block Island.
I gotta be straight with you – it’s a rough outlook. We’re looking at a big gap of nothing before anything even gets a nod. The first real chance to surf doesn’t pop up until Monday, August 17th, so you’ve got about a week of flat and messy conditions to sit through.
Water temp is sitting around 71°F at the start, which is about dead average for the season, so the wetsuit choice is normal.
Tuesday August 11th through Sunday August 16th? Forget it. Tiny swell, messy cross-shore breezes, and the energy is pathetic – barely registering a couple dozen (combined energy of all swells directed here). It’s just not worth a look.
Then, out of nowhere, Monday August 17th morning shows a pulse. We’re looking at 7ft from the SSW with a 7-second period, and the energy jumps to 437 (moderate wave energy). The wind is cross-offshore from the west at 16 mph, which should clean it up a bit. But here’s the thing – that’s a solid size, and Block Island is a point break that *rarely breaks*. It’s inconsistent. So, this is a standout for experienced surfers who know the spot and can handle the likely crowds. The afternoon drops to 6ft and goes cross-shore, so the morning window is the only shot.
After that, it’s back to small stuff. Tuesday August 18th has a clean 4ft from the south with a glassy morning, but the energy is weak (132) and the period is short. It’s a teaser, not a session.
So, bottom line: the only real standout is Monday August 17th morning, but it’s for the dedicated locals. The rest of the forecast is a waiting game for something better.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Tue night. Warm (max 26°C on Tue afternoon, min 22°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 18mm), heaviest on Sun night. Warm (max 25°C on Fri afternoon, min 17°C on Sat morning). Winds increasing (calm on Sun morning, strong winds from the SW by Sun night). | |||||||||||||||||||
Tue 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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) | SW 6 | SSW 6 | SSW 5 | SSW 5 | SW 4 | SSW 5 | SSW 6 | SSW 6 | S 5 | S 5 | S 6 | S 7 | S 7 | S 7 | S 7 | S 7 | SSW 5 | SSW 7 | SSW 7 | S 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 32 | 27 | 15 | 10 | 10 | 17 | 27 | 31 | 14 | 14 | 16 | 26 | 34 | 38 | 39 | 38 | 107 | 437 | 286 | 163 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | cross | cross-on | cross-off | cross | cross-on | cross-off | cross-off | off | off | cross-off | off | off | glassy | cross-on | cross-on | cross-off | 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 | 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 | — | 1 | 1 | — | — | — | — | 2 | — | 1 | — | — | — | — | — | — | 14 | 3 | — | — |
Temp °C | 26 | 26 | 23 | 24 | 24 | 23 | 25 | 26 | 24 | 25 | 21 | 20 | 25 | 25 | 20 | 23 | 23 | 23 | 26 | 26 |
Feels °C | 25 | 25 | 23 | 25 | 24 | 22 | 24 | 26 | 24 | 22 | 18 | 17 | 22 | 22 | 19 | 22 | 20 | 21 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | SSW 6 | SSW 5 | SSW 5 | ESE 8 | SSW 5 | SSW 6 | SSW 6 | S 5 | S 5 | S 6 | S 7 | S 7 | S 7 | S 7 | S 7 | SSE 8 | — | SSW 7 | S 7 |
| kJ | 8 | 27 | 15 | 10 | 7 | 17 | 27 | 31 | 14 | 14 | 16 | 26 | 34 | 38 | 39 | 38 | 7 | — | 286 | 163 |
Swell 2 Height (m) Direction Period (s) | E 8 | ESE 9 | ESE 8 | ESE 8 | SE 14 | SE 8 | SE 8 | ESE 9 | ESE 9 | ESE 9 | SE 9 | SE 9 | NE 4 | ENE 6 | — | SE 9 | — | — | — | SE 16 |
| kJ | 1 | 7 | 7 | 7 | 8 | 3 | 3 | 8 | 8 | 8 | 3 | 3 | 2 | 3 | — | 3 | — | — | — | 10 |
Swell 3 Height (m) Direction Period (s) | — | E 8 | — | S 14 | SE 11 | SE 14 | SE 10 | SE 13 | SE 13 | SE 13 | E 12 | — | SE 9 | SE 9 | SE 9 | NE 4 | — | — | — | E 6 |
| kJ | — | 1 | — | 4 | 5 | 7 | 4 | 7 | 7 | 7 | 3 | — | 3 | 3 | 3 | 1 | — | — | — | 1 |
Wind waves Height (m) Direction Period (s) | SW 6 | W 4 | — | — | SW 4 | — | — | — | — | NNW 3 | N 4 | N 4 | — | SSW 2 | — | — | SSW 5 | SSW 7 | — | NE 2 |
| kJ | 32 | 3 | — | — | 10 | — | — | — | — | 4 | 21 | 16 | — | 1 | — | — | 107 | 437 | — | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2500 | 767 | 846 | 2566 | 642 | 49 | 2567 | 49 | 645 | 2567 | 767 | 152 | 159 | 49 | 49 | 1687 | 1156 | 24 | 24 | 0 |
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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