Surf Forecasts:
Block Island surf forecast from 23 Aug 2026:
- Most powerful swell: Saturday 29 Aug, 2PM (local time) - 3.5ft (1.1m), 7s period, S swell with 114 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 1.1m 7s and forecast to arrive on Saturday (Aug 29) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Wednesday (Aug 26) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sat 29th Aug) | 3.5ft (1.1m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, plugging in the numbers for Block Island. Let’s see what we’ve got.
To be straight with you, the next couple of weeks are looking pretty grim. We’ve got a long stretch of small, messy, and mostly onshore wind slop. From Sunday the 23rd all the way through to the morning of Thursday the 4th of September, the surf is just poor. It’s small, it’s choppy, and the wind is all over the place. There’s nothing worth paddling out for in that first stretch. It’s a real bummer.
The first glimmer of something rideable shows up on the afternoon of Thursday the 4th of September. Block Island is a point break that rarely breaks, so when it does, you pay attention. That afternoon we’ve got a 4 ft swell rolling in from the ESE with a period of 8 seconds. The combined energy is moderate (232), and the wind is a gentle cross-offshore breeze, which will clean things up nicely. It’s not going to be huge, but the conditions will be about as good as they get in this window.
The morning of the 5th looks a bit blown out with a fresh breeze, even though it’s cross-off. The afternoon of the 6th has a bit more size – 5 ft from the S with an 11-second period and very strong energy (510) – but that E wind is going to put a cross-chop on it.
If you’re an expert and you’ve got your eye on the longer period groundswell, the morning of the 7th of September has 5 ft from the SE at 10 seconds, but again, that onshore breeze is going to be a problem.
Honestly, for this whole 16-day run, the standout is the afternoon of Thursday the 4th. It’s not a classic Block Island session, but it’s the cleanest and most promising window we’ve got. For everything else, you might as well stay home.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sun morning. Warm (max 25°C on Sun night, min 20°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Fri morning. Warm (max 24°C on Fri afternoon, min 18°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
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 | SE 8 | SE 12 | S 5 | SSW 6 | SSW 6 | SW 5 | SE 11 | SW 4 | SW 5 | SE 9 | SE 9 | SE 8 | SE 8 | SE 9 | SE 9 | S 6 | S 6 | SSW 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 13 | 11 | 22 | 64 | 38 | 74 | 53 | 20 | 31 | 43 | 29 | 62 | 53 | 49 | 64 | 61 | 91 | 83 | 74 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross | cross-on | cross-off | cross | cross | cross-off | cross | cross | cross-off | cross-on | cross-on | on | cross-on | on | cross-on |
High Tide | 5:21AM0.64m | 5:53PM0.83m | 6:12AM0.69m | 6:36PM0.86m | 6:56AM0.76m | 7:13PM0.89m | 7:35AM0.82m | 7:47PM0.91m | 8:10AM0.87m | 8:18PM0.93m | 8:43AM0.91m | 8:50PM0.94m | |||||||
Low Tide | 11:34PM0.23m | 11:15AM0.22m | 00:18AM0.20m | 12:06PM0.18m | 00:57AM0.14m | 12:50PM0.15m | 1:31AM0.09m | 1:30PM0.11m | 2:02AM0.05m | 2:08PM0.09m | 2:30AM0.02m | 2:43PM0.07m | 2:55AM0.01m | ||||||
 |  |  |  | |  |  | | | | | | | | | |  | | | |
 | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — |
 | 7:35 | — | 7:34 | — | — | 7:31 | — | — | 7:30 | — | — | 7:29 | — | — | 7:27 | — | — | 7:25 | — |
mm | — | 2 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 4 | — |
Temp °C | 21 | 22 | 24 | 25 | 23 | 23 | 24 | 21 | 22 | 23 | 20 | 22 | 23 | 23 | 23 | 23 | 23 | 24 | 23 |
Feels °C | 23 | 24 | 25 | 24 | 22 | 20 | 21 | 17 | 18 | 20 | 18 | 18 | 19 | 24 | 23 | 22 | 23 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 3 | E 4 | S 5 | SE 6 | SE 11 | SW 5 | SSW 6 | SE 6 | SW 5 | SSW 5 | SE 9 | SE 8 | SE 8 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 |
| kJ | 11 | 4 | 3 | 64 | 32 | 19 | 53 | 20 | 9 | 43 | 17 | 62 | 53 | 49 | 64 | 61 | 57 | 53 | 46 |
Swell 2 Height (m) Direction Period (s) | ENE 5 | ESE 7 | ESE 7 | SE 12 | SE 12 | SE 7 | SE 11 | SE 6 | SE 10 | SE 10 | SE 9 | E 8 | SSW 6 | SSW 6 | WSW 4 | E 11 | E 10 | E 10 | E 9 |
| kJ | 4 | 10 | 5 | 22 | 21 | 2 | 18 | 10 | 17 | 25 | 29 | 1 | 6 | 13 | 1 | 2 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 8 | SE 12 | SE 12 | — | E 6 | SE 6 | SE 11 | E 6 | ESE 6 | ESE 8 | — | E 12 | E 11 | E 11 | — | — | — | — |
| kJ | 13 | 11 | 22 | 22 | — | 1 | 5 | 18 | 1 | 7 | 11 | — | 3 | 2 | 2 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SE 3 | S 4 | — | SSW 6 | SSW 6 | W 5 | W 3 | SW 4 | WSW 5 | — | SW 5 | SW 4 | — | SSW 6 | SSE 5 | S 6 | S 6 | SSW 6 |
| kJ | — | 3 | 14 | — | 38 | 74 | 17 | 6 | 31 | 26 | — | 30 | 5 | — | 10 | 22 | 91 | 83 | 74 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 133 | 702 | 236 | 24 | 161 | 195 | 24 | 198 | 198 | 29 | 24 | 195 | 24 | 24 | 1148 | 195 | 270 | 25 | 24 |
Best forecast wave conditions in Rhode Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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