Surf Forecasts:
Block Island surf forecast from 29 Aug 2026:
- Most powerful swell: Wednesday 2 Sep, 11PM (local time) - 4.5ft (1.4m), 8s period, ESE swell with 270 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 1.4m 8s and forecast to arrive on Wednesday (Sep 02) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Monday (Aug 31) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Wed 2nd Sep) | 4.5ft (1.4m) 8s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s happening for Block Island. Gotta be straight with you – it’s a quiet run ahead. This is a point break that rarely breaks, so when it’s this flat for so long, it’s not a huge surprise. We’re looking at a real dry spell through most of the next two weeks.
Right off the bat, from Saturday the 29th of August right through the first week of September, the surf is tiny. We're talking ankle-snappers at best – mostly around 1 ft to 2 ft. A lot of cross-onshore and crummy winds in there, too. Combined energy is weak, with readings like 54 and 52 on Saturday – that's just no juice in the water. Water temp is sitting at 69°, which is about average for this time of year, nothing weird there. Sunday the 30th is even smaller, maybe 1 ft to 3 ft, but that three foot is a short-period, sloppy SW windswell with only a 4-second period – total mush. Monday the 31st has clean conditions with a light NE breeze, but the swell is just 1 ft, so there’s nothing to ride.
There’s a slight uptick on Wednesday the 2nd of September. We get a 5 ft E swell in the morning and 5 ft in the afternoon. The energy bumps up to 299, which is moderate. But the wind is a fresh cross-shore from the ENE, making it lumpy and choppy. Period is only 6 to 7 seconds, so it’s windswell, not groundswell. Not really clean enough to get excited about. Thursday the 3rd is similar with a 3 ft swell and gentle cross-onshore winds – still pretty average.
After that, we drop right back down. From Friday the 4th through Sunday the 6th, it’s back to 1 ft to 2 ft. The 6th has a clean morning with a NE cross-offshore breeze, but again, with 2 ft and 8-second period, you’re just floating around.
The only time things get a little more interesting is around Monday the 8th of September. A 5 ft east swell shows up with energy at 237 to 288 – that’s moderate. But the wind is a fresh cross-shore, 15 to 19 mph, so it's lumpy and messy. On Wednesday the 10th, there's an 11-second period SSE swell with 3 ft, but energy is up at 313. That’s a longer period, which means more shape, but the wind is still fresh cross-shore at 19 mph, so it’s not going to be clean. Later that week, the 11th and 12th, we get some cleaner conditions, but the swell is tiny again – 2 ft to 3 ft.
Come Sunday the 13th of September, we finally see some offshore wind – NNW at 16 mph – but the swell is just 1 ft to 3 ft with short periods. Clean, but no power.
Honestly, the best on offer for the whole 16-day window is probably the morning of Wednesday the 2nd of September. That 5 ft east swell, even with the lumpy cross-shore, is the biggest height we see. But it's not clean. There’s no standout session here. If you’re desperate, maybe the 8th of September for the 5 ft, but you’ll be fighting the chop.
This is a long, flat stretch for Block Island. Keep an eye on the charts, but for now, it’s a waiting game.
- Rusty
Short Range ForecastLight rain (total 8mm), mostly falling on Sun night. Warm (max 23°C on Sun afternoon, min 18°C on Sat morning). Winds decreasing (fresh winds from the SW on Sun afternoon, light winds from the SSE by Mon afternoon). | Days 4-6 Weather SummaryModerate rain (total 15mm), heaviest on Tue afternoon. Warm (max 22°C on Tue morning, min 18°C on Tue night). Winds decreasing (strong winds from the ENE on Wed morning, light winds from the SW by Thu afternoon). | ||||||||||||||||||||
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 | SW 4 | SSW 5 | SE 8 | SE 8 | SE 8 | SE 7 | SSW 5 | SE 12 | E 6 | E 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 7 | E 7 | ESE 7 |
Wave Graph | |||||||||||||||||||||
31 | 31 | 24 | 25 | 36 | 33 | 23 | 23 | 14 | 12 | 56 | 71 | 213 | 218 | 237 | 140 | 114 | 82 | 26 | 24 | 31 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | cross | cross-on | cross-off | cross-off | cross-on | cross-on | cross-on | cross-on | cross-off | cross | cross | cross-on | cross-on | cross | off | cross-off | cross-off | cross-off |
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 | — | — | — | — | — | 8 | — | — | — | — | 5 | 3 | — | — | — | 4 | 2 | 1 | — | — | — |
Temp °C | 20 | 22 | 22 | 22 | 23 | 23 | 20 | 21 | 21 | 22 | 22 | 22 | 19 | 20 | 20 | 21 | 21 | 22 | 19 | 21 | 19 |
Feels °C | 17 | 19 | 19 | 20 | 20 | 21 | 20 | 22 | 21 | 20 | 21 | 23 | 15 | 17 | 18 | 22 | 21 | 24 | 15 | 18 | 15 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | S 5 | SSW 5 | SE 8 | SE 7 | SE 8 | SSW 5 | SSE 11 | SE 10 | SSW 6 | ESE 8 | ESE 8 | ESE 8 | ESE 7 | E 7 | ESE 7 |
31 | 31 | 24 | 25 | 25 | 18 | 12 | 9 | 14 | 12 | 10 | 21 | 78 | 49 | 7 | 140 | 114 | 82 | 26 | 24 | 31 | |
Swell 2 Height (m) Direction Period (s) | S 7 | S 6 | SSW 6 | S 6 | — | WSW 5 | SE 8 | SE 8 | SSW 4 | SE 10 | SE 13 | SE 12 | SW 5 | SSW 5 | SSW 6 | — | — | SSE 5 | SSW 5 | SE 8 | SSW 6 |
21 | 19 | 11 | 2 | — | 21 | 23 | 23 | 4 | 4 | 7 | 71 | 6 | 2 | 14 | — | — | 9 | 8 | 17 | 13 | |
Swell 3 Height (m) Direction Period (s) | E 9 | NE 4 | E 6 | — | E 9 | SE 8 | SW 5 | — | — | SE 14 | SE 10 | — | S 5 | — | — | — | — | SW 5 | SE 8 | S 5 | S 7 |
2 | 2 | 2 | — | 2 | 24 | 7 | — | — | 8 | 4 | — | 2 | — | — | — | — | 6 | 23 | 5 | 1 | |
Wind waves Height (m) Direction Period (s) | NNE 4 | — | WSW 3 | SW 3 | SW 4 | SSW 5 | — | — | — | S 3 | SSW 5 | E 5 | E 6 | E 7 | ESE 8 | SSW 3 | SSW 5 | NW 3 | NW 3 | WSW 3 | NNW 3 |
14 | — | 2 | 7 | 36 | 33 | — | — | — | 5 | 56 | 47 | 213 | 218 | 237 | 12 | 50 | 2 | 2 | 2 | 4 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 25 | 634 | 49 | 702 | 2553 | 24 | 49 | 634 | 249 | 702 | 131 | 244 | 605 | 667 | 24 | 24 | 25 | 24 | 702 | 163 | 49 |
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.











