Surf Forecasts:
Block Island surf forecast from 20 Aug 2026:
- Most powerful swell: Monday 24 Aug, 8PM (local time) - 4.5ft (1.3m), 7s period, S swell with 149 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 Monday (Aug 24) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Tuesday (Aug 25) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Mon 24th Aug) | 4.5ft (1.3m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get straight into what we've got for Block Island.
First up, the water temp is sitting at 70°F, which is spot on average for this time of year – nothing out of the ordinary there.
Now, I have to be honest with you, this is a tough one. The whole 16-day window is looking pretty bleak. We're talking about a stretch of poor surf conditions with no real standout days. The swell is tiny, mostly hanging around 1ft to 3ft, and the energy is weak – we're looking at combined swell energy values mostly in the 20s to 80s, barely a whisper. There's a bit of a pulse around August 28th into early September where the energy climbs into the three-digit range (111 to 159), but even then, the wave heights are still small and the quality is poor.
The only break on the cards is Block Island, a point break that rarely breaks. It's exposed to the south-east, which is the optimum direction, but the swell just isn't there to make it work. The wind does go glassy a few times, like Thursday morning the 20th, and Saturday afternoon the 22nd, but with waves barely 1ft to 2ft, it's not going to be worth paddling out. There's a long stretch from the 20th through to September 3rd with no real surfable waves, so you're looking at a solid two-week gap with nothing on offer.
To be honest, with the swell so small and the consistency so poor, this setup looks more interesting for a kite surfer than a paddle surfer, especially when the wind picks up from the east and north-east later in the period. It's a blank run, and for Block Island, that's just how it goes sometimes.
Rusty.
Short Range ForecastHeavy rain (total 54mm), heaviest during Sat afternoon. Warm (max 25°C on Wed night, min 18°C on Sat morning). Winds increasing (calm on Thu morning, fresh winds from the ENE by Sat morning). | Days 5-7 Weather SummaryModerate rain (total 18mm), heaviest on Sun morning. Warm (max 24°C on Sun night, min 17°C on Sat night). Mainly fresh winds. | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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 7 | SE 7 | SE 8 | SE 8 | ESE 8 | E 4 | S 5 | S 5 | SSE 5 | SE 6 | SSE 6 | S 6 | S 7 | S 6 | S 6 | SE 11 | SW 7 | SSW 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 38 | 20 | 12 | 18 | 18 | 26 | 23 | 37 | 23 | 62 | 52 | 66 | 100 | 86 | 116 | 63 | 35 | 63 | 35 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross-off | cross-off | cross-off | on | cross-on | cross | cross-on | cross-off | cross-off | glassy | cross | cross-off | cross | off | cross-off | cross | cross-off |
High Tide | 1:59AM0.63m | 2:56PM0.80m | 3:09AM0.60m | 4:02PM0.79m | 4:20AM0.60m | 5:03PM0.80m | 5:21AM0.64m | 5:53PM0.83m | 6:12AM0.69m | 6:36PM0.86m | 6:56AM0.76m | 7:13PM0.89m | |||||||
Low Tide | 8:37PM0.25m | 7:19AM0.23m | 9:43PM0.27m | 8:42AM0.25m | 10:43PM0.26m | 10:14AM0.24m | 11:34PM0.23m | 11:15AM0.22m | 00:18AM0.20m | 12:06PM0.18m | 00:57AM0.14m | 12:50PM0.15m | 1:31AM0.09m | ||||||
 |  |  |  | | |  |  | |  |  |  |  | | | | | | | |
 | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — |
 | 7:39 | — | 7:37 | — | — | 7:37 | — | — | 7:35 | — | — | 7:34 | — | — | 7:31 | — | — | 7:30 | — |
mm | — | — | — | 1 | — | — | — | 26 | 27 | 2 | 6 | 4 | 6 | — | — | — | — | — | — |
Temp °C | 25 | 24 | 25 | 22 | 20 | 22 | 22 | 19 | 22 | 19 | 19 | 21 | 24 | 21 | 23 | 23 | 19 | 22 | 21 |
Feels °C | 23 | 26 | 24 | 17 | 18 | 21 | 21 | 16 | 25 | 18 | 20 | 24 | 22 | 18 | 18 | 21 | 15 | 16 | 17 |
Swell 1 Height (m) Direction Period (s) | SE 9 | ESE 7 | SE 7 | SE 8 | SE 8 | ESE 8 | SW 6 | E 4 | S 5 | ESE 8 | SE 6 | SSE 6 | SE 12 | S 7 | S 6 | S 6 | SSW 7 | SE 10 | SSW 6 |
| kJ | 38 | 20 | 12 | 18 | 18 | 26 | 5 | 13 | 23 | 6 | 52 | 66 | 22 | 86 | 116 | 63 | 35 | 17 | 35 |
Swell 2 Height (m) Direction Period (s) | SSE 6 | SSW 5 | SE 9 | N 3 | E 7 | S 6 | SE 14 | ESE 8 | ESE 7 | ESE 9 | SW 5 | SE 12 | E 6 | SE 12 | SSW 7 | SE 11 | SE 6 | SE 5 | W 4 |
| kJ | 10 | 3 | 12 | 2 | 4 | 2 | 7 | 23 | 11 | 8 | 12 | 22 | 3 | 21 | 9 | 18 | 9 | 4 | 5 |
Swell 3 Height (m) Direction Period (s) | SSW 5 | SE 9 | S 5 | E 7 | S 5 | SW 5 | — | SE 13 | E 4 | SE 13 | SE 12 | ESE 7 | E 7 | E 7 | SE 11 | — | SE 11 | E 6 | SE 10 |
| kJ | 3 | 13 | 2 | 4 | 2 | 1 | — | 7 | 3 | 6 | 23 | 5 | 4 | 4 | 19 | — | 29 | 1 | 17 |
Wind waves Height (m) Direction Period (s) | SW 3 | WSW 3 | WSW 2 | NNW 3 | — | — | E 4 | S 5 | — | SSE 5 | — | — | S 6 | — | — | NW 3 | WNW 4 | SW 7 | — |
| kJ | 2 | 1 | 1 | 4 | — | — | 23 | 37 | — | 62 | — | — | 100 | — | — | 5 | 7 | 63 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 198 | 159 | 49 | 198 | 159 | 670 | 743 | 198 | 861 | 29 | 49 | 29 | 24 | 24 | 24 | 24 | 85 | 29 | 198 |
Best forecast wave conditions in Rhode Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Block Island surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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