Surf Forecasts:
Block Island surf forecast from 11 Sep 2026:
- Most powerful swell: Sunday 13 Sep, 8PM (local time) - 3.5ft (1.1m), 6s period, SSE swell with 82 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 1.1m 6s and forecast to arrive on Sunday (Sep 13) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Tuesday (Sep 15) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sun 13th Sep) | 3.5ft (1.1m) 6s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here again, giving you the same outlook but in feet and miles.
We’re looking at a rough couple of weeks for Block Island. This point break doesn’t break often, and for the first ten days, the surf is either tiny or just plain ugly. You’re looking at a big gap with nothing to ride. Water temp is around 69°, which is normal for this time of year.
The first real chance comes on the morning of Friday, September 25th. We get a swell from the ESE around 4ft, with a period of 9 seconds. The energy is moderate at (243). The wind will be offshore out of the NNW at about 15 mph, so the waves will be clean. For this whole forecast, this is the one to target. The offshore wind is a big plus, and with that longer period, the waves should have some push and shape to them. It’s a long way out, so don’t lock it in yet.
After that, it fades. Saturday the 26th gets messy, and then the wind goes offshore again but it’s cranking at 25 mph, making it nearly impossible to paddle into even if it looks clean. So your best bet is that Friday the 25th morning. This spot can get busy, so plan for company.
Rusty.
Short Range ForecastHeavy rain (total 84mm), heaviest during Sun afternoon. Warm (max 24°C on Fri afternoon, min 18°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Mon morning. Warm (max 22°C on Mon afternoon, min 14°C on Mon night). Winds decreasing (fresh winds from the NNE on Mon night, calm by Wed night). | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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) | SSW 6 | SSW 6 | SSW 6 | SE 9 | SE 10 | SE 10 | S 5 | SE 6 | S 6 | SE 9 | SE 8 | SE 8 | SE 9 | SE 9 | E 5 | ESE 5 | E 7 | E 8 | ESE 8 | ESE 6 | ESE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 44 | 26 | 26 | 14 | 15 | 24 | 69 | 40 | 69 | 37 | 46 | 20 | 13 | 15 | 12 | 9 | 28 | 29 | 22 | 16 | 18 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross | cross-off | cross | on | on | cross-on | off | cross | cross-off | cross-off | cross-off | cross | cross-on | cross | cross | cross-on | glassy | cross | cross-on | cross-on |
High Tide | 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 | 1:03PM0.82m | 1:13AM0.61m | |||||||
Low Tide | 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 | 5:32AM0.20m | 7:58PM0.27m | ||||||||
 |  |  | | |  |  |  | | |  | | | | | | | | | | | |
 | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:26 | — | — | 6:28 | — | — |
 | — | 7:02 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:55 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | 31 | 53 | — | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 24 | 23 | 18 | 21 | 22 | 22 | 21 | 22 | 18 | 22 | 21 | 15 | 17 | 16 | 15 | 16 | 17 | 17 | 19 | 20 |
Feels °C | 18 | 20 | 20 | 15 | 20 | 21 | 22 | 22 | 24 | 13 | 20 | 16 | 11 | 15 | 13 | 14 | 15 | 17 | 18 | 20 | 20 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 5 | SE 10 | SE 10 | SE 6 | SE 9 | SE 6 | SE 8 | SE 8 | SE 9 | SE 9 | E 5 | ESE 5 | E 7 | E 8 | ESE 8 | ESE 6 | ESE 7 |
| kJ | 44 | 26 | 26 | 13 | 6 | 24 | 33 | 40 | 29 | 16 | 46 | 20 | 13 | 13 | 12 | 9 | 28 | 29 | 22 | 16 | 18 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 9 | SE 9 | SE 9 | SE 10 | S 9 | — | S 6 | SE 9 | SSW 5 | SW 5 | ESE 9 | S 6 | S 6 | E 7 | ESE 7 | SE 9 | SE 13 | SE 12 | ESE 9 | ESE 12 |
| kJ | 14 | 13 | 13 | 14 | 15 | 2 | — | 34 | 41 | 10 | 4 | 8 | 3 | 3 | 4 | 5 | 3 | 7 | 6 | 8 | 15 |
Swell 3 Height (m) Direction Period (s) | — | — | SSE 6 | SSE 6 | SE 6 | — | — | SE 9 | — | SE 9 | S 5 | S 6 | SE 6 | E 8 | SE 9 | SE 10 | SE 13 | — | SE 9 | SE 12 | SE 9 |
| kJ | — | — | 4 | 4 | 1 | — | — | 31 | — | 37 | 2 | 2 | 1 | 1 | 3 | 4 | 7 | — | 3 | 6 | 3 |
Wind waves Height (m) Direction Period (s) | NW 3 | WSW 3 | — | NE 3 | — | S 4 | S 5 | — | S 6 | NNE 4 | NNE 4 | NNE 4 | ENE 5 | E 4 | — | — | — | — | — | — | S 3 |
| kJ | 2 | 3 | — | 1 | — | 9 | 69 | — | 69 | 14 | 5 | 38 | 45 | 15 | — | — | — | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 49 | 634 | 49 | 1148 | 1158 | 209 | 152 | 24 | 24 | 49 | 49 | 249 | 645 | 1008 | 878 | 1148 | 1148 | 161 | 219 | 161 | 141 |
Best forecast wave conditions in Rhode Island | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Block Island surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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