
Surf Forecasts:
Block Island surf forecast from 16 Sep 2026:
- Best quality surf: Monday 21 Sep, 11AM (local time) - 6.5ft (2.0m), 6s period, ENE swell with cross-offshore winds.
- Most powerful swell: Monday 21 Sep, 2PM (local time) - 7ft (2.2m), 6s period, ENE swell with 369 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 11AM (local time) - 6.5ft (2.0m), 6s period with ENE swell.
Best Forecast Surf Conditions for Block Island this week:
The surf forecast for Block Island over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 21) at 11AM. The primary swell is predicted to be 2.0m and 6s period with a secondary swell of 0.4m and 5s. Another secondary swell of 0.3m and 9s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Block Island in the next 16 days are 2.2m 6s and forecast to arrive on Monday (Sep 21) at 2PM. 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 Saturday (Sep 19) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 21st Sep) | 6.5ft (2.0m) 6s |
| Best Surf | 11AM (Mon 21st Sep) | 6.5ft (2.0m) 6s |
| Most Powerful | 2PM (Mon 21st Sep) | 7ft (2.2m) 6s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, let’s get into it. The next couple of weeks are going to be a real mixed bag around here. There’s a whole lot of small, messy surf on the horizon, but we do have a couple of windows that could get the blood pumping.
For the first few days, it’s gonna be pretty grim. There’s barely a wave to be found, and what’s there is tiny and chopped up. The wind is mostly cross or onshore, so you won’t be rushing to get wet. The energy in the water is weak, down in double digits for the most part, like 19 to 44. It’s just not worth the effort.
Around Friday the 18th, we get a little bump of energy, but the swell height is still nothing special. There’s a moment in the morning with a light offshore wind from the NW, which will clean things up, but the swell is a weak 2ft with a short period of 5 seconds. The combined energy is still under the 100 mark, at 58. It’s a tease more than anything.
The weekend is a write-off. The swell stays small, the wind swings onshore, and you’ve got rain and choppy conditions to deal with. The energy levels are still pretty weak, hitting around 71 to 111. It’s not a surf outlook, it’s a “stay inside” outlook.
Now, here’s where things get a little more interesting. From Monday the 21st into Tuesday the 22nd, this is the standout window for the whole period. A proper ENE swell rolls in, pushing wave heights to the 7ft mark. The period is a short, wind-swell-ish 6 seconds, but the energy jumps way up into the 280-320 range, which shows there’s some real push behind it. The wind is cross-offshore, which is a massive plus, keeping the face clean. A 7ft day with clean conditions and a protected point like Block Island is about as good as it gets. This is the one to keep an eye on. The water temp is sitting at 68° with a normal anomaly of 0.4°, so it’s about standard for this time of year.
After that little pulse, things get messy again. The swell stays in the 5ft to 7ft range, but the wind goes to hell. Strong cross and onshore winds from the E and SE will just tear the surface apart. The energy is still moderate to strong, up in the 400s on Thursday the 24th, but with that wind, it’s going to be a washing machine out there. Not worth it.
The last few days of the month see the swell back down and the wind howling. You’ve got near-gale force winds on the 26th and again on the 30th. There’s a bit of a pulse of S swell around the 27th, but it’s weak, around 2ft, and even though it goes glassy in the afternoon, it’s just too small. The energy is there, around 138-156, but the waves aren't.
So, to sum it up: if you want waves, your window is Monday and Tuesday of next week. It’s not perfect, but it’s the best we’re going to get. Everything else in this 16-day run is either too small, too windy, or both. Still, the forecast can change, and this spot has a way of turning it on when you least expect it. Don’t write it off just yet.
Rusty.
Short Range ForecastSome drizzle, heaviest during Fri morning. Warm (max 22°C on Fri morning, min 16°C on Tue afternoon). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 40mm), heaviest during Sun night. Warm (max 25°C on Fri afternoon, min 14°C on Fri night). Winds increasing (calm on Fri afternoon, fresh winds from the SSE by Sun afternoon). | |||||||||||||||||||
Tue 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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) | ESE 9 | ESE 9 | ESE 9 | E 7 | ESE 7 | E 7 | E 7 | SW 4 | SE 12 | SE 12 | SE 12 | ENE 5 | E 7 | ESE 7 | ESE 7 | SE 10 | SW 6 | ENE 6 | ENE 6 | ENE 6 |
Wave Graph | ||||||||||||||||||||
8 | 8 | 8 | 4 | 18 | 17 | 16 | 37 | 25 | 22 | 21 | 78 | 69 | 41 | 27 | 39 | 44 | 253 | 299 | 279 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross | cross | cross-on | cross-on | cross | off | glassy | cross-off | cross | cross-on | on | cross-on | on | cross-on | cross-off | cross-off | cross-off |
High Tide | 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 | — | — | 6:28 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | |
6:55 | — | — | 6:53 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:46 | — | — | 6:45 | — | |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | 1 | 11 | 5 | 22 | 1 | — | — |
Temp °C | 17 | 17 | 17 | 18 | 20 | 20 | 21 | 21 | 22 | 25 | 21 | 14 | 15 | 17 | 16 | 18 | 19 | 19 | 18 | 16 |
Feels °C | 16 | 16 | 15 | 15 | 18 | 20 | 20 | 19 | 22 | 25 | 16 | 9 | 12 | 14 | 13 | 15 | 16 | 18 | 15 | 11 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | E 4 | E 5 | E 5 | ESE 7 | E 7 | E 7 | ESE 7 | SW 5 | SW 5 | SW 5 | SE 8 | SE 11 | SE 11 | SE 11 | SE 10 | SE 5 | SW 5 | SE 9 | SE 7 |
8 | 6 | 4 | 2 | 18 | 17 | 16 | 9 | 25 | 12 | 3 | 11 | 5 | 19 | 18 | 27 | 43 | 7 | 14 | 48 | |
Swell 2 Height (m) Direction Period (s) | S 6 | ESE 9 | ESE 9 | E 7 | SE 13 | SE 12 | ESE 9 | SE 12 | ESE 7 | ESE 7 | ESE 6 | SE 12 | SW 5 | — | — | ESE 7 | SW 6 | SE 9 | SW 5 | ESE 10 |
3 | 8 | 8 | 4 | 7 | 6 | 8 | 6 | 10 | 9 | 8 | 21 | 1 | — | — | 5 | 44 | 13 | 1 | 9 | |
Swell 3 Height (m) Direction Period (s) | SSW 6 | S 6 | SE 13 | SE 10 | SE 10 | SE 9 | SE 12 | SE 9 | SE 12 | SE 12 | SE 12 | SW 5 | SW 5 | — | — | — | SE 10 | ESE 10 | SW 5 | — |
3 | 1 | 7 | 4 | 4 | 3 | 6 | 3 | 23 | 22 | 21 | 1 | 1 | — | — | — | 16 | 10 | 3 | — | |
Wind waves Height (m) Direction Period (s) | ENE 4 | — | — | SW 3 | SW 3 | SW 3 | SW 4 | SW 4 | N 2 | ENE 2 | NE 4 | ENE 5 | E 7 | ESE 7 | ESE 7 | S 4 | — | ENE 6 | ENE 6 | ENE 6 |
5 | — | — | 2 | 3 | 3 | 14 | 37 | 1 | 1 | 15 | 78 | 69 | 41 | 27 | 39 | — | 253 | 299 | 279 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 3423 | 769 | 767 | 1148 | 642 | 159 | 198 | 642 | 49 | 49 | 249 | 130 | 157 | 533 | 605 | 178 | 117 | 0 | 141 | 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.










