Surf Forecasts:
Block Island surf forecast from 12 Sep 2026:
- Most powerful swell: Wednesday 16 Sep, 2PM (local time) - 2.5ft (0.8m), 8s period, ESE swell with 77 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 0.8m 8s and forecast to arrive on Wednesday (Sep 16) at 2PM. Winds are predicted to be glassy 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 | 2PM (Wed 16th Sep) | 2.5ft (0.8m) 8s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, Rusty here. Let's take a look at what's on the menu for our local spot.
Alright, grab a coffee, because we've got a long wait ahead. Looking at the next 16 days for Block Island, the honest truth is that the surf is flat and unrideable for the first ten days straight. From Saturday the 12th right through to the end of Monday the 21st, it's a wasteland of tiny, weak waves blown out by onshore winds. We're talking swell heights barely reaching 1 ft to 4 ft with energy readings that are basically a whisper (29 to 88). The only window of half-decent shape is on Sunday the 13th afternoon, when a 3 ft S swell gets a brief period of clean offshore wind from the NNW, but that tiny 5-second period means it's all mush and no push. It's a tough run, but that's the rhythm of this place sometimes.
That all changes in the final week. The real standout, and the only window worth getting excited about, is the morning of Wednesday the 23rd of September. The energy jumps to a solid 531, with a clean 7 ft E swell rolling in. The wind is a light offshore from the W, which should leave the surf clean and lined up. At 7 ft, that's a proper size, better suited to experienced surfers. The period is a moderate 8 seconds, which is fine for this point break setup. It’s the one clear gem in an otherwise rough patch.
Following that, the 24th of September sees the biggest swell of the period, with 8 ft of E to ESE swell packing serious energy (1056 to 1086), but howling onshore winds at 28 mph are going to shred it to pieces. Not one to paddle out for. The morning of Saturday the 26th is a decent fallback, with a 3 ft ESE swell and light winds. The energy is a moderate 222, and it should be cleaner than anything we’ve seen, but it’s a distant second to that Wednesday morning.
So, circle the 23rd of September. That’s the one.
Rusty.
Short Range ForecastHeavy rain (total 69mm), heaviest during Sun morning. Warm (max 23°C on Mon afternoon, min 16°C on Mon night). Winds increasing (light winds from the NNW on Sun night, fresh winds from the NNE by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Thu night, min 14°C on Tue night). Winds decreasing (fresh winds from the NE on Tue morning, calm by Wed afternoon). | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 9 | SE 10 | SE 10 | SE 10 | S 5 | S 6 | SE 9 | SE 6 | SE 9 | ENE 5 | E 5 | E 7 | ESE 7 | ESE 8 | ESE 7 | E 7 | E 7 | SW 4 | SW 5 | SW 4 | SE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 14 | 15 | 34 | 33 | 42 | 56 | 27 | 30 | 19 | 73 | 54 | 59 | 71 | 77 | 57 | 37 | 25 | 23 | 31 | 9 | 25 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-on | off | cross | cross-off | cross-off | cross-off | cross | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off |
High Tide | 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 | 2:11PM0.77m | 2:30AM0.59m | |||||||
Low Tide | 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 | 6:24AM0.25m | 9:08PM0.29m | ||||||||
 | |  |  |  |  | | |  | | | | | | | | | |  | | | |
 | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:26 | — | — | 6:28 | — | — | 6:28 | — | — |
 | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:55 | — | — | 6:53 | — | — | 6:52 | — | — | 6:51 | — |
mm | — | — | — | 42 | 23 | 1 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — |
Temp °C | 19 | 21 | 22 | 22 | 21 | 22 | 19 | 23 | 21 | 16 | 17 | 17 | 15 | 16 | 18 | 18 | 19 | 22 | 22 | 20 | 22 |
Feels °C | 17 | 20 | 22 | 23 | 23 | 22 | 15 | 22 | 16 | 12 | 13 | 13 | 14 | 16 | 17 | 18 | 18 | 22 | 22 | 19 | 19 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 5 | SE 10 | SE 10 | S 5 | S 6 | SSE 6 | SE 6 | SE 9 | S 6 | S 6 | SE 10 | ESE 7 | ESE 8 | ESE 7 | E 7 | E 7 | SE 7 | ESE 6 | SW 4 | SE 12 |
| kJ | 11 | 6 | 34 | 33 | 42 | 56 | 15 | 30 | 19 | 3 | 3 | 4 | 71 | 77 | 57 | 37 | 25 | 12 | 8 | 9 | 21 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 10 | SSW 5 | — | SE 9 | SE 9 | SE 9 | ENE 5 | S 6 | ESE 9 | SE 10 | SE 14 | SE 13 | SE 13 | SE 13 | SE 12 | SE 12 | E 6 | ESE 9 | ESE 6 | ESE 8 |
| kJ | 14 | 15 | 2 | — | 30 | 29 | 27 | 9 | 6 | 8 | 4 | 7 | 7 | 7 | 7 | 6 | 6 | 7 | 8 | 8 | 7 |
Swell 3 Height (m) Direction Period (s) | SSE 6 | SE 6 | S 9 | — | SE 9 | ENE 3 | SW 5 | SSW 6 | S 15 | S 15 | S 7 | S 7 | S 6 | — | ESE 13 | ESE 9 | SSE 6 | ESE 12 | ESE 12 | S 4 | SW 4 |
| kJ | 4 | 1 | 2 | — | 31 | 1 | 6 | 6 | 4 | 4 | 1 | 1 | 1 | — | 17 | 8 | 3 | 15 | 14 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | — | — | SSE 3 | SSE 4 | WNW 3 | — | NE 4 | — | NE 4 | ENE 5 | E 5 | E 7 | — | — | — | — | — | SW 4 | SW 5 | WSW 4 | E 5 |
| kJ | — | — | 3 | 19 | 2 | — | 17 | — | 24 | 73 | 54 | 59 | — | — | — | — | — | 23 | 31 | 10 | 25 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 776 | 1156 | 397 | 198 | 24 | 221 | 249 | 29 | 249 | 634 | 1095 | 26 | 115 | 26 | 24 | 133 | 1226 | 198 | 249 | 85 | 198 |
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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