Surf Forecasts:
Block Island surf forecast from 8 Sep 2026:
- Best quality surf: Friday 11 Sep, 5AM (local time) - 4ft (1.2m), 7s period, SSW swell with cross-offshore winds.
- Most powerful swell: Thursday 10 Sep, 8AM (local time) - 8ft (2.4m), 7s period, SW swell with 573 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 5AM (local time) - 4ft (1.2m), 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 Friday (Sep 11) at 5AM. The primary swell is predicted to be 1.2m 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 2.4m 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 0.6m 3s period and expected on Friday (Sep 11) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Fri 11th Sep) | 4ft (1.2m) 7s |
| Best Surf | 5AM (Fri 11th Sep) | 4ft (1.2m) 7s |
| Most Powerful | 8AM (Thu 10th Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s take a look at what’s on the menu for Block Island. Gotta be straight with you – this is a tough one. We’re looking at a long stretch of pretty flat and messy conditions before we finally see a little pulse of life.
The forecast is a real test of patience. We’ve got a solid week and a half of nothing worth paddling out for. From Monday the 7th right through to the morning of Saturday the 19th, it’s mostly poor surf with tiny, weak swell and bad wind. There’s a brief moment on Thursday the 10th when the swell bumps up to `7.5 ft` from the SW with a moderate energy (551), but it’s got a fresh cross-shore wind and lumpy chop, so it’s just a mess. That’s more of a kite-surfing setup than a clean paddle session.
The standout window finally arrives on Saturday the 19th. The morning is where it’s at. Block Island is seeing a `3.6 ft` swell from the S with a period of 7 seconds, and the wind is a gentle offshore breeze from the NE. The combined energy is a solid 217, which is moderate. It’s gonna be clean, and that offshore wind will really help. The water temp is sitting around `69.6°`, which is about normal for the time of year. The afternoon stays glassy with a `3.6 ft` S swell, but the energy dips a bit to 158. Still, it’s a good day to be out there. Just keep in mind this spot *rarely breaks*, so it’s a special treat when it lines up like this.
That’s your window. Everything else is a wait-and-see. The long-range stuff on the 22nd is too small and onshore to get excited about. Stay tuned, because forecasts can change, but for now, mark your calendar for that Saturday morning.
Short Range ForecastMostly dry. Warm (max 25°C on Mon night, min 21°C on Mon night). Winds increasing (calm on Wed morning, strong winds from the SW by Wed night). | Days 5-7 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 23°C on Thu afternoon, min 17°C on Sat morning). Winds decreasing (fresh winds from the WSW on Thu night, light winds from the WNW by Fri night). | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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) | E 9 | E 9 | E 9 | SW 4 | SE 9 | E 9 | SW 5 | SW 7 | SW 7 | SW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 6 | SE 9 | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 15 | 15 | 8 | 10 | 12 | 7 | 54 | 458 | 537 | 301 | 180 | 88 | 68 | 31 | 14 | 14 | 15 | 46 | 42 | 51 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | cross-off | cross | cross-off | cross-on | cross-on | cross-on | cross | cross | cross-off | off | cross | cross-off | cross-on | on | on | cross-on | cross-on | cross |
High Tide | 5:35PM0.99m | 6:03AM0.88m | 6:31PM1.01m | 6:57AM0.97m | 7:21PM1.02m | 7:46AM1.04m | 8:07PM1.01m | 8:32AM1.08m | 8:50PM0.98m | 9:16AM1.09m | 9:33PM0.93m | 9:59AM1.06m | 10:14PM0.87m | |||||||
Low Tide | 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 | 2:47PM-0.03m | 2:59AM-0.02m | 3:32PM-0.01m | 3:29AM0.02m | 4:16PM0.04m | 3:55AM0.06m | |||||||
 |  |  | |  | | | |  | |  | | | | | | | | | | |
 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — |
 | 7:08 | — | — | 7:07 | — | — | 7:06 | — | — | 7:04 | — | — | 7:02 | — | — | 7:00 | — | — | 6:59 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 25 | 21 | 24 | 24 | 22 | 23 | 23 | 22 | 23 | 23 | 20 | 22 | 23 | 19 | 20 | 21 | 22 | 22 | 22 |
Feels °C | 22 | 22 | 19 | 20 | 21 | 24 | 22 | 18 | 19 | 21 | 20 | 17 | 20 | 22 | 17 | 17 | 18 | 21 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | SW 4 | SSE 9 | SE 9 | SSE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SSW 7 | SSW 7 | SSW 7 | SSW 6 | SW 6 | SSW 5 | SE 10 | SE 10 | SE 9 | SE 9 |
| kJ | 15 | 15 | 5 | 8 | 12 | 7 | 15 | 12 | 13 | 14 | 180 | 88 | 68 | 31 | 8 | 3 | 15 | 46 | 42 | 51 |
Swell 2 Height (m) Direction Period (s) | SSE 8 | WSW 4 | E 9 | E 8 | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | SE 10 | SE 10 | SE 10 | SSE 7 | SSE 6 | SE 10 | SW 5 | SSW 6 | SE 5 | SSW 6 |
| kJ | 7 | 1 | 6 | 6 | 6 | 6 | 2 | 1 | 1 | 1 | 15 | 14 | 14 | 4 | 7 | 14 | 1 | 4 | 1 | 3 |
Swell 3 Height (m) Direction Period (s) | — | SSE 8 | SSE 9 | NE 4 | S 6 | SE 10 | — | — | — | — | E 8 | — | — | ESE 9 | SE 9 | SSE 6 | SSW 5 | SSW 6 | — | — |
| kJ | — | 7 | 8 | 1 | 1 | 4 | — | — | — | — | 1 | — | — | 8 | 14 | 4 | 2 | 4 | — | — |
Wind waves Height (m) Direction Period (s) | W 3 | NW 3 | NNW 2 | SW 4 | WSW 4 | SW 4 | SW 5 | SW 7 | SW 7 | SW 7 | — | NNW 4 | NW 4 | NNE 2 | ENE 4 | E 3 | SE 3 | S 6 | SSW 6 | SW 3 |
| kJ | 5 | 2 | 1 | 10 | 10 | 6 | 54 | 458 | 537 | 301 | — | 10 | 2 | 1 | 10 | 5 | 3 | 7 | 12 | 4 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 133 | 426 | 482 | 769 | 615 | 665 | 1067 | 1095 | 26 | 219 | 24 | 24 | 29 | 642 | 776 | 769 | 605 | 397 | 249 | 24 |
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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