Surf Forecasts:
Block Island surf forecast from 4 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 5AM (local time) - 10ft (3.0m), 8s period, SW swell with 1,008 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 3.0m 8s and forecast to arrive on Thursday (Sep 10) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Friday (Sep 11) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Thu 10th Sep) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the cards for our local waters.
Alright, I gotta be straight with you – it's a tough start. We're looking at a long stretch of very small, poor quality surf. The first week and a half is basically a write-off for any decent waves. From Friday the 4th of September right through to the end of the following week, you're looking at tiny 1ft to 3ft swells, mostly with messy winds or the wrong direction. The combined energy is weak, barely cracking 70 (say, 44 to 72). It's a frustrating, flat spell for a spot that rarely breaks anyway.
The one glimmer of hope, and it's a real long-shot, shows up on Monday the 14th of September. We get a jump in swell to about 6ft from the SW. The combined energy gets a proper kick to 320, which is a solid moderate energy. The wind on the Monday morning is a light breeze, cross-off, which should keep it pretty clean. The period is a short 6 seconds though, which means it'll be a bit fat and weak, more of a push than a proper wall. It's a real standout just because it's the only thing on offer, but if you're desperate, that's your window. The afternoon looks good too with 5.5ft swell and a fresh offshore from the NW, but the energy dips a bit to 276 and the wind is stronger, making it trickier. The water temperature is about 68.7°F, which is pretty average for early September, so nothing wild there.
For the rest of the 16-day stretch, it's firmly in the "don't bother" category. The winds are mostly onshore or cross-shore with no real quality to the waves. For a spot like Block Island that "rarely breaks", this blank run is pretty normal. It often takes a real injection of energy to get it going, and that won't happen until that brief window on the 14th. Keep an eye on the forecasts, but for now, the board stays in the car.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri morning. Warm (max 28°C on Fri afternoon, min 17°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Wed night. Warm (max 24°C on Tue night, min 17°C on Mon morning). Winds increasing (light winds from the NW on Tue morning, near gales from the SW by Wed night). | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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 | SW 6 | SE 8 | SE 9 | E 7 | ENE 9 | E 10 | E 10 | E 10 | E 10 | E 10 | E 9 | SW 4 | SW 5 | SW 6 | SW 7 | SW 8 | SW 8 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 23 | 22 | 16 | 9 | 12 | 12 | 16 | 62 | 49 | 30 | 31 | 31 | 16 | 15 | 13 | 43 | 178 | 667 | 669 | 424 | 114 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | cross-off | cross | cross-off | cross-off | cross | off | off | cross-on | off | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-off | cross-off | off |
High Tide | 1:55PM0.95m | 2:32AM0.71m | 3:13PM0.94m | 3:50AM0.73m | 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 | ||||||||
Low Tide | 9:21PM0.17m | 8:08AM0.12m | 10:31PM0.14m | 9:43AM0.11m | 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 | ||||||||
 |  |  | | |  |  | | | | | | | | | | |  | | | | |
 | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — |
 | — | 7:14 | — | — | 7:13 | — | — | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:06 | — | — | 7:04 | — |
mm | 3 | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 25 | 28 | 26 | 21 | 21 | 19 | 17 | 19 | 20 | 20 | 23 | 22 | 21 | 23 | 24 | 22 | 22 | 23 | 23 | 23 | 18 |
Feels °C | 26 | 25 | 23 | 19 | 19 | 15 | 13 | 17 | 17 | 17 | 20 | 18 | 18 | 19 | 20 | 21 | 18 | 16 | 18 | 16 | 10 |
Swell 1 Height (m) Direction Period (s) | SSW 4 | ESE 7 | SE 8 | SW 6 | SW 5 | E 7 | E 7 | ENE 9 | E 10 | E 10 | E 10 | SW 4 | SW 4 | E 9 | E 9 | E 9 | SE 10 | SE 9 | ESE 9 | ESE 10 | SSW 7 |
| kJ | 7 | 15 | 16 | 9 | 7 | 8 | 16 | 62 | 49 | 30 | 31 | 7 | 4 | 15 | 6 | 6 | 15 | 13 | 8 | 9 | 114 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 8 | E 6 | E 6 | E 7 | SE 9 | SSW 6 | SSW 6 | SW 3 | SSW 7 | SSW 6 | E 10 | E 10 | SE 9 | SE 9 | SE 10 | E 9 | E 8 | — | — | SE 10 |
| kJ | 23 | 17 | 7 | 7 | 8 | 12 | 8 | 7 | 1 | 4 | 4 | 31 | 16 | 3 | 3 | 4 | 2 | 1 | — | — | 4 |
Swell 3 Height (m) Direction Period (s) | ESE 6 | S 8 | SW 4 | SE 8 | SE 8 | SSW 5 | SE 9 | SE 9 | SSW 6 | SE 9 | SE 8 | SE 8 | SE 9 | — | — | SE 8 | — | — | — | — | ESE 10 |
| kJ | 14 | 1 | 3 | 9 | 9 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | — | — | 3 | — | — | — | — | 9 |
Wind waves Height (m) Direction Period (s) | — | WSW 4 | NNW 4 | N 3 | ENE 4 | ENE 4 | NE 5 | — | — | NNW 3 | WSW 2 | W 4 | — | SW 3 | SW 4 | SW 5 | SW 6 | SW 7 | SW 8 | SW 8 | N 4 |
| kJ | — | 22 | 8 | 3 | 12 | 18 | 30 | — | — | 3 | 1 | 5 | — | 5 | 13 | 43 | 178 | 667 | 669 | 424 | 48 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 29 | 49 | 249 | 767 | 182 | 207 | 99 | 24 | 85 | 49 | 24 | 138 | 445 | 642 | 606 | 608 | 606 | 1148 | 249 | 1805 | 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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