Surf Forecasts:
Block Island surf forecast from 29 Aug 2026:
- Best quality surf: Thursday 3 Sep, 8PM (local time) - 4.5ft (1.3m), 7s period, SSE swell with cross-offshore winds.
- Most powerful swell: Thursday 3 Sep, 11AM (local time) - 7ft (2.1m), 7s period, S swell with 390 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 8PM (local time) - 4.5ft (1.3m), 7s period with SSE 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 Thursday (Sep 03) at 8PM. The primary swell is predicted to be 1.3m and 7s period with a secondary swell of 1.1m and 7s. 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 Thursday (Sep 03) at 11AM. 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 Saturday (Aug 29) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Thu 3rd Sep) | 4.5ft (1.3m) 7s |
| Best Surf | 8PM (Thu 3rd Sep) | 4.5ft (1.3m) 7s |
| Most Powerful | 11AM (Thu 3rd Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here, and I've gotta be straight with you – it's a tough run for Block Island. This outlook covers a full 16 days, but honestly, there's a whole lot of nothing on the menu for most of it.
Let's start with the water. The ocean temp is sitting at a pretty average 69°F for this time of year, nothing unusual there.
The first real window where we might see a pulse of energy is Wednesday, September 2nd, but it's a messy one. The swell is bumping up to 5ft to 6ft from the SE, but it's a short-period, wind-driven thing around 5 seconds. The combined energy is moderate (260-231), but the wind is howling out of the east at 22 mph, creating a lumpy, cross-onshore mess. You'd be fighting a losing battle out there. This is more of a kite-surfing setup than a paddle-surfing one.
We then get a bit more size on Thursday, September 3rd, with swell climbing to 7ft from the S, but again, the period is short at 7 seconds and the energy is moderate (390). The wind is a cross-shore from the WSW, which won't give us that clean, glassy face we're after. It's still a choppy mess.
The real outlier, and the only thing that gets my heart rate up, comes on Wednesday, September 9th. We've got a 3ft to 5ft swell from the SSE, but the key difference is the period jumps to 10-12 seconds – that's a proper groundswell. The combined energy is strong (583-688), and the wind is a clean cross-off shore from the WNW. That's a recipe for some clean, lined-up waves at Block Island, especially with the swell coming from the SE which is the optimum direction for this spot. The size is perfect for a wide range of surfers, and the long period will mean deeper, more powerful waves. It's a long way out, so keep your fingers crossed, but this is the one to circle on the calendar.
After that brief spark, the energy drops right off again. The rest of the period is filled with tiny, weak swells and bad wind directions, so you're not missing much.
So, to sum it up: it's a long, dry spell until the 9th of September. That Wednesday morning is your best, and really your only, shot at some quality waves. The rest of the time, save your petrol and wax. If you're not a surfer, the wind and swell on the 2nd and 3rd might make for some interesting kite sessions.
Stay salty,
Rusty
Short Range ForecastLight rain (total 7mm), mostly falling on Sun night. Warm (max 24°C on Sun night, min 18°C on Sat morning). Winds decreasing (fresh winds from the SW on Sun night, light winds from the N by Mon morning). | Days 4-6 Weather SummaryHeavy rain (total 34mm), heaviest during Tue morning. Warm (max 28°C on Thu night, min 18°C on Tue night). Winds decreasing (strong winds from the ESE on Tue afternoon, light winds from the W by Thu night). | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
AM | 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) | SE 8 | SE 8 | SE 8 | SE 8 | SSW 4 | SW 5 | SE 8 | SE 8 | SE 8 | SE 7 | SSE 4 | SE 12 | SE 5 | SE 6 | SSE 6 | S 7 | SE 7 | SSE 7 | SSE 7 | SE 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 31 | 31 | 34 | 25 | 29 | 53 | 23 | 17 | 10 | 12 | 21 | 71 | 146 | 231 | 134 | 390 | 223 | 154 | 47 | 23 | 19 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | cross | cross | cross-off | off | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | cross | cross | cross-off | cross-off | on | cross-on |
High Tide | 9:14AM0.95m | 9:25PM0.94m | 9:47AM0.98m | 10:03PM0.92m | 10:23AM0.99m | 10:44PM0.88m | 11:05AM1.00m | 11:30PM0.83m | 11:52AM0.99m | 00:21AM0.77m | 12:48PM0.97m | 1:21AM0.73m | 1:55PM0.95m | 2:32AM0.71m | |||||||
Low Tide | 3:19PM0.05m | 3:22AM0.00m | 3:56PM0.05m | 3:52AM0.01m | 4:38PM0.06m | 4:27AM0.03m | 5:25PM0.09m | 5:08AM0.05m | 6:26PM0.13m | 5:56AM0.08m | 7:52PM0.16m | 6:55AM0.10m | 9:21PM0.17m | ||||||||
 | |  | | |  | | |  |  | |  |  |  | |  |  | | | |  | |
 | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — |
 | — | 7:23 | — | — | 7:22 | — | — | 7:21 | — | — | 7:19 | — | — | 7:17 | — | — | 7:15 | — | — | 7:14 | — |
mm | — | — | — | — | — | 7 | — | — | — | 12 | 11 | 3 | 4 | — | 1 | 3 | — | — | — | — | 5 |
Temp °C | 20 | 21 | 22 | 22 | 23 | 24 | 20 | 22 | 22 | 22 | 20 | 19 | 18 | 19 | 23 | 23 | 27 | 28 | 20 | 21 | 21 |
Feels °C | 17 | 19 | 19 | 20 | 20 | 21 | 21 | 22 | 22 | 21 | 18 | 13 | 14 | 14 | 22 | 24 | 27 | 30 | 19 | 22 | 21 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SW 5 | SSW 5 | SSW 5 | SE 8 | SE 7 | SE 13 | SE 12 | SE 11 | — | — | — | SE 7 | SSE 7 | SSE 7 | SSE 6 | SW 4 |
| kJ | 31 | 31 | 34 | 25 | 25 | 53 | 8 | 8 | 10 | 12 | 7 | 71 | 114 | — | — | — | 223 | 154 | 47 | 23 | 5 |
Swell 2 Height (m) Direction Period (s) | S 7 | S 6 | SSW 6 | SSW 6 | — | SE 8 | SW 5 | SE 8 | SSW 5 | SE 10 | SE 13 | — | — | — | — | — | — | — | E 7 | SE 8 | E 8 |
| kJ | 21 | 19 | 11 | 3 | — | 18 | 10 | 17 | 4 | 4 | 7 | — | — | — | — | — | — | — | 22 | 17 | 19 |
Swell 3 Height (m) Direction Period (s) | E 9 | NE 4 | E 6 | S 6 | E 9 | SE 8 | SE 8 | WSW 5 | SSE 6 | SE 14 | — | — | — | — | — | — | — | — | SE 8 | E 7 | SSE 7 |
| kJ | 2 | 2 | 2 | 2 | 2 | 18 | 23 | 2 | 4 | 8 | — | — | — | — | — | — | — | — | 23 | 14 | 15 |
Wind waves Height (m) Direction Period (s) | NNE 4 | — | WSW 3 | WSW 3 | SSW 4 | N 2 | N 3 | — | — | SW 4 | SSE 4 | SSE 4 | SE 5 | SE 6 | SSE 6 | S 7 | SSW 7 | NW 3 | NW 3 | SW 4 | — |
| kJ | 10 | — | 1 | 4 | 29 | 1 | 1 | — | — | 5 | 21 | 34 | 146 | 231 | 134 | 390 | 138 | 4 | 3 | 3 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 25 | 634 | 49 | 642 | 1814 | 24 | 24 | 1156 | 1156 | 1156 | 1156 | 156 | 292 | 2500 | 230 | 24 | 24 | 24 | 25 | 182 | 648 |
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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