Surf Forecasts:
Block Island surf forecast from 27 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 2AM (local time) - 7.5ft (2.3m), 7s period, ESE swell with 475 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 2.3m 7s and forecast to arrive on Thursday (Sep 03) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Tuesday (Sep 01) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Thu 3rd Sep) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, let’s talk Block Island. I’ve combed through the whole 16-day picture, and it’s a tough one. The story is almost all “poor surf conditions” – a long, quiet stretch from the start with nothing to get excited about.
The first real blip on the radar comes around Thursday morning, September 3rd. A big east swell hits at 3.0m, with massive energy (1040), but the wind is strong and cross-shore from the ENE at 30 km/h, and the period is short at 8 seconds. That’s expert-only, messy, and lumpy – barely worth a look. It fades to 1.7m in the afternoon, but the wind stays nasty.
Friday, September 4th morning is the best of a bad lot. Swell is 1.7m from the east, period 9 seconds, and the wind shifts to cross-offshore from the NE at 30 km/h. The wave comment says “clean,” and the energy is 480 – moderate. That’s your window. But it’s only a morning thing; the afternoon gets lumpy again.
After that, it’s downhill. By Saturday, September 5th, it’s 1.0m, and then it’s a long slide into tiny, weak, onshore slop. The last week gives you swells under 0.9m, periods of 6-8 seconds, and mostly choppy, cross-shore winds. There’s a glassy moment on Thursday morning, September 10th, but the swell is a measly 0.4m – flat and clean, but flat.
The water temperature is about average for this time of year.
So, if you’re holding out for something, the Friday, September 4th morning session at Block Island is your best bet. It’s the only clean, cross-off window with a decent east swell. But it’s not a standout, just the least bad option. I’d say this is a rare dry spell for the island. Forecasts can turn, but right now, don’t hold your breath.
Rusty
Short Range ForecastSome drizzle, heaviest during Fri afternoon. Warm (max 25°C on Fri night, min 18°C on Sat morning). Winds decreasing (fresh winds from the S on Thu night, light winds from the SE by Sat afternoon). | Days 5-7 Weather SummaryModerate rain (total 17mm), heaviest on Tue morning. Warm (max 23°C on Sun morning, min 18°C on Tue afternoon). Winds decreasing (fresh winds from the SW on Sun night, calm by Mon afternoon). | ||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | ||||||||||||||
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 8 | SE 9 | S 6 | SE 8 | SSW 6 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SW 4 | SW 5 | SSE 5 | SE 8 | SW 5 | SE 6 | SE 10 | E 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 70 | 74 | 77 | 77 | 70 | 54 | 51 | 40 | 31 | 42 | 35 | 25 | 31 | 39 | 23 | 30 | 11 | 15 | 91 |
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 | cross-on | off | cross-off | cross-on | cross | cross | cross-on | cross | cross-off | glassy | cross-on | cross-on | cross | 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 | |||||||
Low Tide | 2:02AM0.05m | 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 | |||||||
 |  |  | | |  | | | |  | | | |  |  |  |  |  | | |
 | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 7:29 | — | 7:27 | — | — | 7:25 | — | — | 7:23 | — | — | 7:22 | — | — | 7:21 | — | — | 7:19 | — |
mm | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 1 | — | 1 | 14 | 1 | — |
Temp °C | 23 | 23 | 24 | 23 | 24 | 24 | 25 | 19 | 21 | 22 | 23 | 23 | 23 | 20 | 21 | 21 | 19 | 19 | 19 |
Feels °C | 23 | 21 | 22 | 22 | 25 | 25 | 26 | 18 | 21 | 22 | 21 | 20 | 20 | 21 | 22 | 22 | 16 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 9 | SE 8 | SE 8 | SE 8 | SSW 6 | S 6 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSW 5 | ESE 4 | SE 6 | SW 5 | S 6 | SE 10 |
| kJ | 70 | 74 | 77 | 72 | 70 | 54 | 35 | 38 | 31 | 42 | 35 | 25 | 17 | 15 | 6 | 14 | 5 | 6 | 23 |
Swell 2 Height (m) Direction Period (s) | S 6 | E 8 | E 11 | E 11 | E 10 | E 10 | SE 8 | SE 8 | S 6 | SSW 6 | SSW 6 | E 9 | E 8 | WSW 4 | SE 8 | ESE 4 | SE 6 | SE 10 | SE 12 |
| kJ | 6 | 1 | 9 | 2 | 2 | 2 | 51 | 40 | 18 | 12 | 6 | 2 | 1 | 4 | 23 | 1 | 11 | 15 | 23 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | E 9 | E 9 | NE 4 | — | S 6 | — | — | — | — | — | SE 10 | SE 13 | SSW 5 |
| kJ | — | — | — | — | — | — | 2 | 2 | 2 | — | 2 | — | — | — | — | — | 4 | 7 | 2 |
Wind waves Height (m) Direction Period (s) | SW 3 | SSW 3 | SSW 4 | S 6 | SSW 6 | SSW 6 | — | NE 3 | — | — | SW 3 | SW 4 | SW 5 | SSE 5 | SSW 4 | SW 5 | NNE 4 | NE 5 | E 6 |
| kJ | 3 | 7 | 17 | 77 | 56 | 43 | — | 5 | — | — | 1 | 22 | 31 | 39 | 12 | 30 | 17 | 119 | 91 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 24 | 152 | 1148 | 152 | 82 | 161 | 25 | 25 | 85 | 24 | 49 | 2714 | 249 | 24 | 776 | 204 | 702 | 182 | 182 |
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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