Surf Forecasts:
Block Island surf forecast from 4 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 8AM (local time) - 10ft (3.0m), 8s period, SW swell with 960 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 3.0m 8s and forecast to arrive on Thursday (Sep 10) 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 1.6m 5s period and expected on Friday (Sep 11) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Thu 10th Sep) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, strap in, because this is a rough one. We’re looking at the next 16 days for Block Island, a point break that rarely breaks, and the outlook is bleak. Water temp is about 69°F, which is normal for this time of year, so no surprises there. The problem is, from Friday, September 4th, all the way through to Wednesday, September 9th, there’s nothing. Zero. Swell heights are tiny, mostly 1ft to 3ft, with weak energy and short periods. The wind is all over the place, and it’s just not happening.
Then, on Thursday, September 10th, we get a spike. The morning shows a 8ft swell from the SW, with a massive energy reading of 719. That’s a lot of water moving. But the wind is a strong 25 mph cross-offshore from the W. That’s going to be a washing machine. For a spot that’s inconsistent, that size is well over 5ft, so it’s expert-only territory, and with a period of just 8 seconds, it’s a messy windswell, not a clean wave. The afternoon drops to 6ft, still big, still windy. This setup looks more like a kite-surfing day than a good paddle session.
After that one day, it’s all over. From Friday, September 11th, through to Saturday, September 19th, we’re back to flatness. A few glassy moments, like on Saturday, September 12th afternoon with a glassy 0.3ft swell, but you can’t surf air. It’s a long, blank run with one brief, wild spike. For a place that rarely breaks, this kind of stretch is normal. It’s a wait-and-see situation, but right now, I’d leave the board at home.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat afternoon. Warm (max 27°C on Fri afternoon, min 16°C on Sat night). Winds decreasing (fresh winds from the NE on Sat night, light winds from the W by Sun night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Wed night. Warm (max 24°C on Tue afternoon, min 17°C on Mon morning). Winds increasing (calm on Tue night, strong winds from the SW by Wed night). | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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 | SSW 6 | SW 6 | SE 9 | E 9 | E 9 | E 10 | E 9 | E 10 | E 10 | E 9 | SW 5 | E 9 | E 4 | SE 10 | SW 7 | SW 8 | SW 8 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 23 | 23 | 16 | 11 | 14 | 12 | 15 | 56 | 47 | 28 | 53 | 34 | 16 | 31 | 7 | 26 | 15 | 754 | 706 | 424 | 119 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | on | off | off | cross-on | cross-off | cross-off | cross | cross-on | on | cross | cross-on | cross-off | cross-off | off |
High Tide | 1:55PM0.95m | 2:32AM0.71m | 3:13PM0.94m | 3:50AM0.73m | 4:30PM0.96m | 5:02AM0.80m | 5:35PM0.99m | 6:03AM0.88m | 6:31PM1.01m | 6:57AM0.97m | 7:21PM1.02m | 7:46AM1.04m | 8:07PM1.01m | ||||||||
Low Tide | 9:21PM0.17m | 8:08AM0.12m | 10:31PM0.14m | 9:43AM0.11m | 11:29PM0.10m | 11:08AM0.07m | 00:20AM0.05m | 12:13PM0.02m | 1:06AM0.01m | 1:09PM-0.02m | 1:47AM-0.02m | 2:00PM-0.03m | 2:25AM-0.03m | ||||||||
 | |  | |  |  |  | | | | |  | | | |  | | | | | | |
 | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — |
 | — | 7:14 | — | — | 7:13 | — | — | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:06 | — | — | 7:04 | — |
mm | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 24 | 27 | 26 | 21 | 21 | 18 | 18 | 20 | 20 | 20 | 21 | 22 | 22 | 24 | 23 | 22 | 22 | 23 | 23 | 24 | 21 |
Feels °C | 24 | 25 | 24 | 19 | 19 | 13 | 14 | 19 | 20 | 18 | 18 | 18 | 20 | 21 | 22 | 22 | 21 | 17 | 19 | 18 | 15 |
Swell 1 Height (m) Direction Period (s) | SSW 4 | ESE 7 | SE 8 | SSW 6 | SW 6 | SSW 6 | SSW 6 | E 9 | E 10 | E 9 | E 10 | E 10 | SW 5 | E 9 | SW 4 | SW 5 | E 4 | SE 9 | SE 9 | ESE 9 | SW 7 |
| kJ | 7 | 15 | 16 | 11 | 8 | 8 | 8 | 56 | 47 | 28 | 53 | 30 | 10 | 6 | 7 | 9 | 10 | 13 | 13 | 8 | 119 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 8 | E 6 | E 6 | E 7 | SE 9 | E 7 | SE 9 | SW 4 | SSW 5 | SE 8 | SE 8 | E 9 | SE 9 | SE 9 | SE 10 | SE 10 | E 8 | — | — | ESE 10 |
| kJ | 23 | 23 | 7 | 7 | 8 | 12 | 9 | 3 | 3 | 3 | 3 | 3 | 16 | 3 | 3 | 4 | 15 | 1 | — | — | 9 |
Swell 3 Height (m) Direction Period (s) | E 6 | — | SW 4 | SE 8 | SE 8 | — | E 9 | SE 9 | SSW 6 | SE 9 | SSW 6 | — | SE 9 | — | E 9 | SE 8 | E 9 | — | — | — | — |
| kJ | 13 | — | 3 | 9 | 9 | — | 15 | 3 | 3 | 3 | 4 | — | 3 | — | 6 | 3 | 2 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SW 4 | NNW 3 | N 3 | ENE 4 | ENE 6 | NE 5 | SW 6 | WNW 4 | NNW 3 | SW 3 | WSW 4 | WNW 2 | SW 5 | NE 3 | E 4 | SSW 5 | SW 7 | SW 8 | SW 8 | WNW 5 |
| kJ | — | 14 | 8 | 3 | 14 | 72 | 24 | 9 | 2 | 3 | 4 | 34 | 1 | 31 | 2 | 26 | 15 | 754 | 706 | 424 | 91 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 49 | 161 | 249 | 634 | 648 | 157 | 54 | 24 | 59 | 130 | 131 | 131 | 49 | 775 | 445 | 608 | 1067 | 1008 | 40 | 25 | 846 |
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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