Surf Forecasts:
Block Island surf forecast from 7 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 11AM (local time) - 8ft (2.5m), 7s period, SW swell with 627 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 2.5m 7s and forecast to arrive on Thursday (Sep 10) at 11AM. 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 Monday (Sep 07) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Thu 10th Sep) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's be honest about the next couple of weeks around Block Island. We're looking at a pretty flat spell for the most part, so temper those expectations.
The first little bit of hope doesn't appear until Sunday the 6th of September, but it's a tease. We've got a tiny 1ft easterly swell with a short 7-second period, and the water is sitting at a pretty average 70°. The combined energy is a weak 29, and the wave comment says it all: "poor surf conditions." The glassy conditions (SSW 3 mph) will make the water look pretty, but there's just nothing to ride. Don't bother.
The whole first week is a write-off. We get a brief window of cleaner conditions with a NNW offshore wind on Monday morning the 7th, but the swell is still 1ft and weak (39 energy). It's a waste of a good offshore wind. The end of the first week gets a bit ugly with a strong SW breeze kicking up some messy, lumpy conditions on the 10th, pushing an 8ft cross-shore swell, but the quality is terrible. That's not surfable, that's a washing machine.
The entire second week, from the 11th to the 20th, is more of the same. We bounce between 1.0ft and 2ft of weak, short-period swell, with the occasional clean-ish morning but nothing with any push. The combined energy values rarely break 50, which is just sad. There is a little bump on the 20th of September (Sunday) where the swell picks up to 4ft from the SW with a 5-second period, and the energy hits 118 (moderate), but it's accompanied by a messy 16 mph cross-onshore wind. It's a no-go.
The best this stretch gets is the very tail end on Monday the 21st of September. The morning is a washout with rain and a fresh cross-onshore, but by the afternoon, the wind swings to a clean NNW offshore at 12 mph. The swell is still only 2ft from the SSW, but the moderate offshore wind will make it look clean. The energy is a paltry 50. It's not a standout, it's just the least bad option.
Honestly, for the entire 16-day window, there is nothing even close to a standout. This is a tough run for Block Island. It's a rare-breaks spot anyway, and these forecasts are a perfect example of why. The best advice is to leave the boards in the car and enjoy the island for something else. The forecasts can change, but right now, there's nothing to get excited about.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sun night. Warm (max 25°C on Tue afternoon, min 17°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Thu night. Warm (max 23°C on Thu morning, min 17°C on Fri morning). Winds decreasing (strong winds from the SW on Wed night, light winds from the E by Sat morning). | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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 7 | ENE 8 | E 10 | E 9 | E 9 | E 9 | SSE 9 | SE 9 | SW 4 | SW 4 | SW 6 | SW 7 | SW 7 | SSW 7 | SSW 6 | SSW 6 | SE 9 | SSE 6 | S 6 | SE 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 17 | 21 | 30 | 15 | 15 | 8 | 8 | 12 | 6 | 31 | 331 | 627 | 394 | 198 | 68 | 50 | 15 | 22 | 22 | 15 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | off | cross | off | cross-off | cross | cross-off | cross-on | cross-on | cross-on | cross | cross | cross-off | off | cross-off | cross | cross-on | on | cross-on |
High Tide | 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 | 8:32AM1.08m | 8:50PM0.98m | 9:16AM1.09m | 9:33PM0.93m | |||||||
Low Tide | 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 | 2:47PM-0.03m | 2:59AM-0.02m | 3:32PM-0.01m | 3:29AM0.02m | |||||||
 |  |  | |  | | |  | | |  | |  | | | | | | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — |
 | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:06 | — | — | 7:04 | — | — | 7:02 | — | — | 7:00 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | 6 | — | — | — | — | — | — |
Temp °C | 19 | 20 | 20 | 24 | 24 | 23 | 25 | 25 | 22 | 22 | 22 | 23 | 22 | 22 | 18 | 22 | 22 | 18 | 19 | 20 |
Feels °C | 18 | 17 | 16 | 22 | 21 | 21 | 22 | 23 | 23 | 19 | 20 | 19 | 17 | 18 | 12 | 18 | 18 | 17 | 18 | 20 |
Swell 1 Height (m) Direction Period (s) | ENE 5 | ENE 8 | E 10 | E 9 | E 9 | SW 4 | SSE 9 | SE 9 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SSW 7 | SSW 6 | SSW 6 | SSW 6 | SSE 6 | S 6 | SSW 6 |
| kJ | 9 | 21 | 30 | 15 | 15 | 7 | 8 | 12 | 3 | 15 | 13 | 12 | 13 | 198 | 68 | 50 | 13 | 22 | 22 | 13 |
Swell 2 Height (m) Direction Period (s) | E 7 | E 10 | SSE 9 | SSE 8 | SW 4 | E 9 | E 9 | E 9 | SE 10 | E 9 | E 8 | E 8 | E 8 | SE 10 | SE 10 | SE 9 | SSE 6 | SW 6 | SE 6 | SE 10 |
| kJ | 17 | 17 | 7 | 7 | 2 | 6 | 6 | 6 | 4 | 2 | 1 | 1 | 1 | 15 | 15 | 14 | 15 | 5 | 9 | 15 |
Swell 3 Height (m) Direction Period (s) | SSW 6 | SSE 9 | S 5 | S 5 | SSE 8 | SSE 9 | SW 5 | S 6 | E 9 | — | — | — | — | — | E 8 | — | SE 9 | SE 9 | SE 9 | SSE 6 |
| kJ | 3 | 8 | 2 | 1 | 7 | 8 | 1 | 1 | 2 | — | — | — | — | — | 1 | — | 13 | 14 | 14 | 7 |
Wind waves Height (m) Direction Period (s) | — | W 3 | WNW 3 | W 3 | NW 2 | — | WSW 3 | WSW 4 | SW 4 | SW 4 | SW 6 | SW 7 | SW 7 | — | N 3 | WSW 2 | — | NNE 3 | — | — |
| kJ | — | 2 | 8 | 3 | 1 | — | 8 | 10 | 6 | 31 | 331 | 627 | 394 | — | 3 | 1 | — | 1 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 130 | 49 | 49 | 49 | 426 | 482 | 776 | 665 | 665 | 1008 | 1084 | 340 | 237 | 24 | 26 | 24 | 634 | 769 | 3363 | 642 |
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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