Surf Forecasts:
Block Island surf forecast from 15 Sep 2026:
- Most powerful swell: Tuesday 22 Sep, 5AM (local time) - 4.5ft (1.3m), 7s period, E swell with 178 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 1.3m 7s and forecast to arrive on Tuesday (Sep 22) 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 1.3m 6s period and expected on Monday (Sep 21) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Tue 22nd Sep) | 4.5ft (1.3m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, grab a coffee and settle in, 'cause the next couple of weeks for Block Island are lookin' pretty grim. This isn't gonna be one for the memories, I'll tell ya that. We’re lookin' at a real long stretch of flat, messy, and pretty much unsurfable conditions for the first week and a half. There's a big ol' gap of just poor surf with cross-shore junk, onshore crud, and tiny ankle-slappers that aren't worth paddling out for. You'll be staring at a blank ocean for most of the run.
Now, the one tiny, barely-there glimmer comes on Sunday the 27th. We’ve got a pulse of swell at 4ft from the SE, but the real story with that early morning is the wind. It's dead calm, glassy. For a few precious hours, the surface will be like a mirror. But, and it’s a big but, the waves themselves are ordinary at best – just a crumbly little SE swell with a short period of 7 seconds. It's surfable, but you really gotta want it. The water temp is sitting at 68°, which is bang on average for this time of year.
After that little blip, things go right back to junk with more cross-shore wind and fading energy. The whole 16-day window is a write-off with only that single moment of glassy calm making it anything other than a kite-surfing session.
So, the only real shout is Block Island (United States) on the 27th morning. It’s a point break that rarely breaks and is often crowded, so if that tiny window does line up, expect company. The swell is 4ft from the SE, and with glassy conditions, you might scratch out a few soft ones. But don't plan your week around it.
Stay frosty, and keep checking back. It can't stay this flat forever.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Thu morning, min 14°C on Tue morning). Winds increasing (light winds from the E on Tue afternoon, fresh winds from the SW by Thu night). | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Sun morning. Warm (max 24°C on Fri afternoon, min 15°C on Sun night). Winds increasing (calm on Fri afternoon, strong winds from the SW by Sun morning). | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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 | ESE 9 | E 5 | ESE 9 | E 5 | ESE 7 | ESE 7 | SW 4 | SW 4 | WSW 5 | SSW 5 | ESE 7 | SE 12 | ESE 8 | ESE 7 | S 6 | SSE 6 | SE 6 | ENE 6 | E 6 | E 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 21 | 8 | 8 | 8 | 5 | 18 | 17 | 12 | 29 | 51 | 15 | 9 | 25 | 40 | 68 | 160 | 96 | 45 | 124 | 124 | 173 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | on | cross-on | cross | cross | cross-on | cross-on | cross | off | glassy | cross-off | cross | on | on | cross | off | cross-off | cross | cross | cross |
High Tide | 11:24AM0.95m | 11:35PM0.73m | 12:09PM0.88m | 00:20AM0.66m | 1:03PM0.82m | 1:13AM0.61m | 2:11PM0.77m | 2:30AM0.59m | 3:24PM0.75m | 3:49AM0.61m | 4:27PM0.76m | 4:52AM0.66m | 5:17PM0.78m | ||||||||
Low Tide | 5:46PM0.16m | 4:52AM0.16m | 6:44PM0.22m | 5:32AM0.20m | 7:58PM0.27m | 6:24AM0.25m | 9:08PM0.29m | 7:41AM0.28m | 10:08PM0.27m | 9:50AM0.27m | 10:58PM0.24m | 10:54AM0.24m | 11:39PM0.19m | ||||||||
 | |  |  | | | | |  | | | | | |  |  |  |  | |  | | |
 | 6:26 | — | — | 6:26 | — | — | 6:28 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — |
 | — | 6:55 | — | — | 6:53 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:46 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 10 | 4 | — | — | — | — |
Temp °C | 15 | 16 | 16 | 17 | 18 | 20 | 21 | 21 | 21 | 22 | 24 | 21 | 17 | 17 | 20 | 21 | 22 | 16 | 16 | 17 | 16 |
Feels °C | 12 | 15 | 14 | 15 | 15 | 18 | 20 | 19 | 18 | 21 | 24 | 19 | 13 | 14 | 15 | 16 | 20 | 10 | 13 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | SE 9 | ENE 4 | E 5 | ESE 5 | E 5 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | SW 5 | SSW 5 | E 4 | ESE 8 | ESE 11 | SE 11 | SE 11 | SSE 6 | SE 6 | SE 9 | SE 9 | SE 10 |
| kJ | 21 | 5 | 7 | 5 | 4 | 18 | 17 | 9 | 9 | 37 | 15 | 5 | 25 | 12 | 19 | 18 | 96 | 45 | 13 | 13 | 15 |
Swell 2 Height (m) Direction Period (s) | SSW 6 | ESE 9 | ESE 9 | ESE 9 | ESE 7 | SE 13 | SE 12 | SE 12 | SE 12 | ESE 7 | ESE 7 | SW 4 | SE 12 | SW 4 | SW 4 | — | SE 10 | SE 10 | SSE 6 | SW 5 | — |
| kJ | 4 | 8 | 8 | 8 | 5 | 7 | 6 | 6 | 6 | 9 | 9 | 5 | 21 | 1 | 1 | — | 17 | 17 | 4 | 1 | — |
Swell 3 Height (m) Direction Period (s) | SSE 6 | S 6 | S 6 | SE 13 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 12 | ESE 12 | ESE 7 | SSW 4 | SW 4 | — | — | — | E 8 | SW 5 | — | — |
| kJ | 4 | 3 | 1 | 7 | 3 | 3 | 3 | 3 | 3 | 14 | 14 | 9 | 2 | 1 | — | — | — | 1 | 1 | — | — |
Wind waves Height (m) Direction Period (s) | ENE 4 | — | — | — | SW 3 | SW 3 | SW 4 | SW 4 | SW 4 | WSW 5 | — | — | ESE 3 | ESE 8 | ESE 7 | S 6 | — | NE 5 | ENE 6 | E 6 | E 7 |
| kJ | 17 | — | — | — | 3 | 3 | 7 | 12 | 29 | 51 | — | — | 2 | 40 | 68 | 160 | — | 53 | 124 | 124 | 173 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 775 | 769 | 415 | 767 | 1148 | 844 | 844 | 1148 | 198 | 49 | 49 | 249 | 1156 | 1156 | 748 | 398 | 26 | 207 | 665 | 30 | 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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