Surf Forecasts:
Block Island surf forecast from 10 Sep 2026:
- Best quality surf: Thursday 10 Sep, 11PM (local time) - 4.5ft (1.3m), 7s period, SSW swell with cross-offshore winds.
- Most powerful swell: Thursday 10 Sep, 8AM (local time) - 7ft (2.2m), 7s period, SW swell with 475 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 11PM (local time) - 4.5ft (1.3m), 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 Thursday (Sep 10) at 11PM. The primary swell is predicted to be 1.3m and 7s period with a secondary swell of 0.3m and 10s. 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 2.2m 7s 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 0.4m 3s period and expected on Friday (Sep 11) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 10th Sep) | 4.5ft (1.3m) 7s |
| Best Surf | 11PM (Thu 10th Sep) | 4.5ft (1.3m) 7s |
| Most Powerful | 8AM (Thu 10th Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m going over the numbers for Block Island. I’ll be honest—if you’re looking to paddle out here for the next two weeks, you’re in for a rough ride.
Block Island is a point break that rarely breaks, and this 16-day forecast basically shows no real surf opportunities. The first slim chance of anything worth checking doesn’t arrive until Wednesday, September 23rd. That is nearly two weeks of flat or junk surf before you even get a look.
The only day that nearly works is Wednesday afternoon, September 23rd. A moderate SE swell pushes in around 4ft with an 8-second period. The combined wave energy is moderate at 212. The wind finally cooperates, going offshore from the NNW at around 22 mph, so it’s clean. That’s the one bright spot, but it’s still considered marginal at best. Don't expect perfection.
Before that, it’s a mess. Constant cross-shore winds, lumpy conditions, and tiny, weak swell. There’s a glassy window on Sunday the 13th in the afternoon with a light west wind, but the waves are barely 3ft and weak—not enough to get excited about. Later, on Monday the 21st, we see a bigger, more powerful swell of 8ft from the ENE with a combined energy of 528, but the wind is screaming 22 mph cross-shore. That’s raw, onshore chop, not a surfable wave. That setup is better for kite surfers than anyone with a paddle.
For beginners, waves over 5ft are too big, so that 4ft on the 23rd is manageable. For experts, there’s nothing here with real quality and clean conditions. Water temp is around 69°F, which is about normal for the time of year.
Bottom line: Block Island is a no-go for the foreseeable future. Your only shot is a marginal, clean window on the 23rd, and that’s a long way off.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sat night. Warm (max 25°C on Thu afternoon, min 18°C on Fri night). Winds decreasing (fresh winds from the WSW on Thu morning, light winds from the ENE by Sat morning). | Days 4-6 Weather SummaryHeavy rain (total 24mm), heaviest during Sun morning. Warm (max 24°C on Mon afternoon, min 17°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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) | SW 7 | SW 7 | SSW 7 | SSW 6 | SSW 6 | SSW 7 | SE 9 | SE 10 | SE 10 | SSE 5 | SSE 5 | SE 9 | SE 9 | SE 9 | SE 9 | E 5 | ESE 6 | SE 9 | S 4 | SSW 4 | SSW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 386 | 254 | 110 | 55 | 28 | 41 | 15 | 15 | 24 | 52 | 48 | 29 | 77 | 29 | 31 | 54 | 34 | 15 | 13 | 41 | 102 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | off | off | cross | cross-off | cross-on | on | cross-on | cross-on | glassy | cross | off | cross-on | cross-off | cross-on | on | cross-on | cross | cross-on | cross-on |
High Tide | 8:07PM1.01m | 8:32AM1.08m | 8:50PM0.98m | 9:16AM1.09m | 9:33PM0.93m | 9:59AM1.06m | 10:14PM0.87m | 10:41AM1.01m | 10:54PM0.80m | 11:24AM0.95m | 11:35PM0.73m | 12:09PM0.88m | 00:20AM0.66m | ||||||||
Low Tide | 2:00PM-0.03m | 2:25AM-0.03m | 2:47PM-0.03m | 2:59AM-0.02m | 3:32PM-0.01m | 3:29AM0.02m | 4:16PM0.04m | 3:55AM0.06m | 4:59PM0.09m | 4:21AM0.11m | 5:46PM0.16m | 4:52AM0.16m | 6:44PM0.22m | ||||||||
 |  |  | | |  | | |  |  | | | | | | | | | | | | |
 | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:26 | — | — |
 | — | 7:04 | — | — | 7:02 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:55 | — | — | 6:53 | — |
mm | — | — | — | — | — | — | — | — | 1 | 24 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 25 | 24 | 21 | 24 | 24 | 20 | 21 | 23 | 21 | 22 | 23 | 23 | 24 | 22 | 18 | 18 | 19 | 20 | 20 | 21 |
Feels °C | 18 | 22 | 22 | 17 | 19 | 20 | 19 | 21 | 22 | 22 | 26 | 25 | 22 | 25 | 20 | 15 | 16 | 16 | 17 | 16 | 18 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 9 | SSW 7 | SSW 6 | SSW 6 | SSW 7 | SSW 6 | SW 6 | SE 10 | SE 10 | SSE 5 | SSE 5 | SE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 |
| kJ | 13 | 13 | 110 | 55 | 28 | 41 | 15 | 9 | 24 | 33 | 48 | 28 | 77 | 19 | 20 | 8 | 8 | 13 | 13 | 8 | 8 |
Swell 2 Height (m) Direction Period (s) | E 8 | E 8 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 10 | ESE 3 | S 9 | SE 9 | SE 9 | — | SSW 5 | SSW 6 | SSW 6 | SSW 6 | SE 14 | E 4 | SE 13 | SE 13 |
| kJ | 1 | 1 | 15 | 14 | 14 | 14 | 14 | 15 | 1 | 2 | 30 | 29 | — | 6 | 6 | 4 | 3 | 7 | 2 | 7 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SSE 7 | SSE 6 | SSE 6 | SSE 6 | — | — | — | — | — | SSW 5 | SSE 6 | SE 15 | SE 15 | E 6 | SE 13 | E 6 | E 6 |
| kJ | — | — | — | — | 5 | 4 | 4 | 4 | — | — | — | — | — | 5 | 6 | 8 | 8 | 1 | 7 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | SW 7 | SW 7 | — | NNW 2 | WSW 2 | — | ENE 2 | ESE 3 | S 5 | SSE 5 | — | — | — | SE 6 | ENE 4 | E 5 | ESE 6 | SE 4 | S 4 | SSW 4 | SSW 5 |
| kJ | 386 | 254 | — | 1 | 1 | — | 1 | 1 | 9 | 52 | — | — | — | 29 | 31 | 54 | 34 | 15 | 13 | 41 | 102 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 26 | 219 | 24 | 29 | 152 | 49 | 776 | 642 | 249 | 29 | 24 | 24 | 24 | 24 | 767 | 2626 | 1084 | 847 | 217 | 195 | 608 |
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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