Surf Forecasts:
Block Island surf forecast from 27 Aug 2026:
- Best quality surf: Thursday 3 Sep, 5AM (local time) - 4.5ft (1.4m), 5s period, E swell with cross-offshore winds.
- Most powerful swell: Thursday 3 Sep, 8AM (local time) - 4.5ft (1.4m), 6s period, E swell with 121 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 5AM (local time) - 4.5ft (1.4m), 5s period with E 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 Thursday (Sep 03) at 5AM. The primary swell is predicted to be 1.4m and 5s period with a secondary swell of 0.5m and 7s. Another secondary swell of 0.4m 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 1.4m 6s and forecast to arrive on Thursday (Sep 03) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Wednesday (Sep 02) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 3rd Sep) | 4.5ft (1.4m) 5s |
| Best Surf | 5AM (Thu 3rd Sep) | 4.5ft (1.4m) 5s |
| Most Powerful | 8AM (Thu 3rd Sep) | 4.5ft (1.4m) 6s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, let’s talk Block Island (Block Island). Water’s about 69°, normal for this time of year. But I’ll tell you, the next 16 days look rough. Starting Thursday the 27th of August, we’ve got a tiny 2ft swell from the southeast, only 8 seconds between waves, and a cross-onshore wind from the SSW at 12 mph. Choppy and no good. This junk carries through Friday and Saturday. Saturday morning cleans up with a cross-off wind from the NNE at 9 mph, but the swell is just 2ft, energy’s weak (80)—not worth it.
Sunday the 30th and Monday the 31st, swell drops to 1ft, energy in the 40s. Just flat and messy. Tuesday the 1st of September is clean with a fresh cross-off breeze from the NNE and NE at 18–25 mph, but the swell is only 3ft with a 5-second period—short and weak.
Wednesday the 2nd of September brings a 2ft SE swell with an 11-second period and moderate energy (162). But there’s an onshore wind from the SSE at 9 mph in the morning, so it’s not clean.
Thursday the 3rd of September is the first real hope. A 5ft east swell at 6 seconds hits with a light cross-off wind from the WNW at 6 mph and clean conditions. Energy’s moderate at 184. The comment says “surfable waves but very ordinary conditions.” Still, it’s the best so far.
Friday the 4th of September has a 4ft east swell at 8 seconds with a strong north wind at 22 mph. Clean but likely blown out. Saturday the 5th is 3ft from the ESE at 9 seconds, energy 111—just okay.
Then Monday the 7th of September morning is the standout. Glassy—wind from the east at just 3 mph—with a 5ft SW swell at 6 seconds. Energy is strong at 210. The comment says “expect good surf conditions.” This is the morning to go. The swell direction is southwest, close to the optimum SE, so it’ll wrap in okay. The period is short, so it’s a windswell, not groundswell, but with glassy conditions, you’ll get clean little waves. The afternoon gets cross-shore and drops in quality.
Tuesday the 8th of September stays around 5ft to 6ft from the SSW with cross-onshore wind at 12–16 mph. Choppy and poor. Wednesday the 9th fades to 3ft then 3ft with fresh cross-onshore wind—lumpy. Thursday the 10th is tiny again at 1ft. Friday the 11th of September sees a final spike to 6ft–7ft from the SSW at 6–7 seconds, with cross to cross-on wind at 12 mph. Strong energy (315–389) but poor conditions—wind will rip it up.
Best on offer? Monday the 7th of September morning—glassy, 5ft, clean, moderate energy. That’s your window. But overall, this is a tough stretch for Block Island. The break rarely breaks, and the wind usually screws it up when there is swell. Big gap of nothing late August to early September, then just a brief moment of surfable waves. Keep an eye on it, but don’t hold your breath.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Fri afternoon. Warm (max 25°C on Fri afternoon, min 18°C on Sat morning). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 18mm), heaviest on Mon night. Warm (max 24°C on Sun night, min 18°C on Tue night). Winds decreasing (fresh winds from the SW on Sun night, light winds from the ENE by Tue night). | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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 9 | SE 8 | SE 8 | SE 8 | S 6 | SE 8 | SE 8 | SE 8 | SE 8 | SSW 6 | SE 8 | SE 8 | SSW 5 | SSE 6 | SSW 5 | SW 5 | SSW 6 | SE 11 | SE 10 | E 5 |
Wave Graph | |||||||||||||||||||||
74 | 77 | 72 | 70 | 66 | 50 | 40 | 31 | 34 | 25 | 25 | 23 | 22 | 39 | 34 | 40 | 51 | 37 | 75 | 64 | 68 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | off | cross-off | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross-off | cross-off | cross | on | cross-on | cross-on |
High Tide | 8:10AM0.87m | 8:18PM0.93m | 8:43AM0.91m | 8:50PM0.94m | 9:14AM0.95m | 9:25PM0.94m | 9:47AM0.98m | 10:03PM0.92m | 10:23AM0.99m | 10:44PM0.88m | 11:05AM1.00m | 11:30PM0.83m | 11:52AM0.99m | 00:21AM0.77m | |||||||
Low Tide | 2:08PM0.09m | 2:30AM0.02m | 2:43PM0.07m | 2:55AM0.01m | 3:19PM0.05m | 3:22AM0.00m | 3:56PM0.05m | 3:52AM0.01m | 4:38PM0.06m | 4:27AM0.03m | 5:25PM0.09m | 5:08AM0.05m | 6:26PM0.13m | ||||||||
6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | |
— | 7:27 | — | — | 7:25 | — | — | 7:23 | — | — | 7:22 | — | — | 7:21 | — | — | 7:19 | — | — | 7:17 | — | |
mm | — | — | — | — | 1 | 1 | — | — | — | — | — | — | 1 | — | 16 | 1 | — | — | — | 5 | 7 |
Temp °C | 23 | 24 | 23 | 24 | 25 | 25 | 19 | 21 | 22 | 22 | 23 | 24 | 23 | 23 | 24 | 21 | 20 | 19 | 20 | 20 | 22 |
Feels °C | 22 | 23 | 22 | 25 | 25 | 27 | 17 | 20 | 20 | 21 | 22 | 21 | 23 | 24 | 25 | 20 | 17 | 16 | 20 | 20 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 9 | SE 8 | S 6 | SE 8 | S 6 | S 6 | S 6 | S 6 | S 6 | SE 8 | SE 8 | SE 8 | SE 7 | SSE 6 | SE 8 | SE 8 | SSW 6 | SSW 6 | SSW 6 | SSW 7 |
74 | 77 | 72 | 32 | 66 | 44 | 38 | 25 | 17 | 15 | 25 | 23 | 22 | 11 | 31 | 3 | 16 | 37 | 40 | 19 | 25 | |
Swell 2 Height (m) Direction Period (s) | E 8 | E 11 | SE 8 | SE 8 | S 6 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | — | E 8 | — | SE 8 | SE 8 | SE 10 | SE 13 | SE 9 | SE 11 | SE 10 | SE 10 |
1 | 9 | 72 | 70 | 24 | 50 | 40 | 31 | 34 | 25 | — | 1 | — | 11 | 3 | 4 | 7 | 12 | 75 | 64 | 47 | |
Swell 3 Height (m) Direction Period (s) | — | — | E 11 | E 10 | E 10 | E 9 | E 9 | ENE 4 | — | — | — | — | — | — | — | S 14 | — | SE 12 | — | — | — |
— | — | 2 | 2 | 2 | 2 | 2 | 1 | — | — | — | — | — | — | — | 4 | — | 23 | — | — | — | |
Wind waves Height (m) Direction Period (s) | SSW 6 | S 4 | S 5 | — | — | — | NNE 3 | — | — | — | SSW 6 | SW 4 | SW 4 | SSW 5 | SW 5 | SSW 5 | SW 5 | ENE 4 | ENE 5 | E 5 | E 5 |
18 | 13 | 56 | — | — | — | 4 | — | — | — | 25 | 15 | 20 | 39 | 34 | 40 | 51 | 28 | 47 | 40 | 68 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 133 | 1148 | 26 | 159 | 159 | 25 | 24 | 24 | 24 | 49 | 3395 | 702 | 702 | 769 | 274 | 24 | 2553 | 25 | 24 | 219 | 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.











