Surf Forecasts:
Block Island surf forecast from 28 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 5PM (local time) - 7.5ft (2.3m), 7s period, SSW swell with 475 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 2.3m 7s and forecast to arrive on Thursday (Sep 03) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Friday (Sep 04) at 2PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Thu 3rd Sep) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, this is Rusty.
Look, I've been staring at the charts for Block Island and, to be honest, the next week and a half is looking like a write-off. We’re staring down the barrel of a real flat spell here. From Friday the 28th of August all the way through to Tuesday the 8th of September, there is simply nothing worth paddling out for. It’s a long, dry stretch of tiny, weak swells and rubbish winds. You’d be wasting your time.
The first real glimmer of hope, and I mean the *only* highlight in this entire 16-day window, arrives on Wednesday the 9th of September. The morning is the call. We get a clean, light offshore breeze out of the NNW and a proper long-period groundswell pushing in from the SSE at 14 seconds. That’s a long period, which means real energy and shape, especially for a point break like Block Island. Swell height is only 3ft, but the combined energy is a solid 372, which is a decent kick. The water temp is sitting at 69°F, which is about average for this time of year, no surprises there.
Thursday the 10th of September morning could be even better for the early birds. The swell drops a touch to 4ft from the same SSE direction, but the period is still a long 12 seconds, and with a light offshore from the NW, conditions will be glassy. The energy is still strong at 505. Just be aware this is a rarely breaks spot, so when it does line up, it’s a treat but expect it to be inconsistent between sets. Also, it gets overcrowded here often, so get there early or be prepared to share.
After that, we get another shot on Friday the 11th of September morning. Clean conditions again with a light NNE breeze and a 5ft SSW swell, but the period drops to 7 seconds. It’s a bit of a shorter-period wind swell, so the quality won’t be anywhere near as good as the 9th and 10th. The energy is solid at 468, but those waves will be a bit more crumbly.
Honestly, the standout is clear: Wednesday morning, September the 9th. It’s not a massive swell, but that long-period groundswell combining with a glassy offshore wind is as good as it gets for that stretch. Thursday morning is a close second. Anything else in the second week, like Saturday the 12th, has clean winds and a bit of size (6ft), but the short period means it’ll be a bit messy and probably only for the more experienced crew. For the rest of us, circle the 9th and 10th on your calendar.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Sun night. Warm (max 25°C on Fri night, min 17°C on Sat morning). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 27mm), heaviest during Wed night. Warm (max 23°C on Mon afternoon, min 19°C on Wed night). Winds increasing (light winds from the S on Mon afternoon, strong winds from the SSW by Thu morning). | |||||||||||||||||||
Fri 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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 | SE 8 | SW 6 | SW 4 | SW 5 | SW 5 | SE 8 | SE 7 | SE 4 | SE 4 | SE 12 | SE 11 | SE 10 | SE 9 | S 6 | SSW 7 | S 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 78 | 61 | 30 | 31 | 34 | 20 | 25 | 51 | 28 | 16 | 14 | 13 | 23 | 71 | 94 | 79 | 55 | 253 | 475 | 220 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | cross-off | cross-on | cross-off | cross | cross-on | cross-off | off | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-off | cross-off |
High Tide | 8:50PM0.94m | 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 | |||||||
Low Tide | 2:43PM0.07m | 2:55AM0.01m | 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 | |||||||
 |  | | | |  |  |  | | | | | |  | | |  |  |  | | |
 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 7:25 | — | — | 7:23 | — | — | 7:22 | — | — | 7:21 | — | — | 7:19 | — | — | 7:17 | — | — | 7:15 | — |
mm | — | — | — | — | — | — | — | 7 | — | — | — | — | — | — | — | — | 14 | 13 | 4 | — |
Temp °C | 24 | 25 | 19 | 21 | 22 | 22 | 23 | 23 | 21 | 23 | 22 | 21 | 21 | 21 | 21 | 20 | 21 | 21 | 23 | 21 |
Feels °C | 26 | 25 | 16 | 19 | 19 | 20 | 20 | 21 | 21 | 22 | 20 | 19 | 17 | 17 | 19 | 17 | 17 | 18 | 24 | 20 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | S 6 | SE 8 | SE 8 | SE 8 | SW 5 | SW 5 | SSW 5 | SE 7 | SSW 5 | SE 8 | SE 12 | SE 11 | SE 10 | SE 9 | SE 9 | SSE 7 | S 7 |
| kJ | 78 | 61 | 30 | 19 | 34 | 18 | 25 | 51 | 28 | 13 | 14 | 2 | 10 | 71 | 94 | 79 | 55 | 29 | 237 | 220 |
Swell 2 Height (m) Direction Period (s) | S 6 | SSW 6 | S 7 | SE 8 | SSW 6 | SE 6 | E 5 | SE 8 | SE 8 | SE 8 | SSW 5 | SE 10 | SSW 5 | SW 5 | — | SW 5 | — | — | — | — |
| kJ | 25 | 11 | 21 | 31 | 12 | 6 | 1 | 18 | 23 | 16 | 4 | 4 | 2 | 1 | — | 1 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | E 10 | E 9 | E 9 | E 7 | E 6 | S 6 | E 9 | — | — | SW 5 | — | SE 14 | SE 10 | — | — | — | — | — | — | — |
| kJ | 2 | 2 | 2 | 4 | 3 | 2 | 2 | — | — | 5 | — | 8 | 4 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NNW 3 | NNE 4 | — | WSW 3 | SW 6 | SW 4 | — | — | — | E 3 | SE 4 | SE 4 | SE 5 | SE 5 | SE 5 | SSE 4 | S 6 | SSW 7 | — |
| kJ | — | 3 | 8 | — | 3 | 20 | 23 | — | — | — | 6 | 13 | 23 | 35 | 41 | 33 | 29 | 253 | 475 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 25 | 99 | 25 | 24 | 49 | 665 | 2530 | 24 | 49 | 769 | 275 | 359 | 2553 | 642 | 25 | 791 | 608 | 398 | 24 | 25 |
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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