Surf Forecasts:
Block Island surf forecast from 31 Aug 2026:
- Most powerful swell: Tuesday 1 Sep, 8PM (local time) - 6ft (1.8m), 6s period, ESE swell with 248 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 1.8m 6s and forecast to arrive on Tuesday (Sep 01) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Sunday (Sep 06) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Tue 1st Sep) | 6ft (1.8m) 6s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, this is a tough one to call. To be straight with you, the whole 16-day window for Block Island is looking pretty grim. We’ve got a long stretch of nothing coming up, so don’t get your hopes up. The forecast is basically a wasteland for surf, especially from the start of the period all the way into the first week of September.
Let’s talk about the water first. For the early part of the forecast, the water temp is sitting at 70°F, which is pretty much spot on for this time of year – nothing unusual there.
The first real sniff of anything that might be worth a paddle comes on Wednesday, September 9th, in the morning. Block Island is our only option, and it’s a rare one – this spot *rarely breaks*. The swell is coming from the SW at 5ft, but with a short period of only 6 seconds. That’s a weak, choppy swell. The wind will be a clean cross-off from the NNE at 12 mph, which is good, but the combined energy is only moderate (236). It’s only a marginal call, and for a spot that’s inconsistent, it’s a gamble.
The next little window shows up on Saturday, September 12th. The morning session has a 6ft SSW swell with a 6-second period, and light cross-off winds from the west. The energy is moderate (260). The afternoon is the real standout of the whole forecast. We get a solid 7ft SSW swell, and the wind swings to a fresh offshore NNW at 22 mph. That’s clean. The energy jumps to 372. But here’s the thing – that 7ft is getting into expert territory, and given the short period, it’s going to be a bit of a washing machine. It’s the best we’ve got, but it’s not a day for beginners.
After that, it fades back to nothing. Sunday the 13th has a weak 4ft SSW swell, and then it’s back to tiny, poor surf through the rest of the window. The run from the 14th onward is completely dead.
So, to sum it up: you’ve got a long dry spell from the start until September 9th. The only time it’s worth loading up the boards is for the afternoon of September 12th at Block Island, but only if you’re an experienced surfer. The rest of the time, the island is just a flat, choppy mess.
- Rusty
Short Range ForecastHeavy rain (total 27mm), heaviest during Tue afternoon. Warm (max 22°C on Tue afternoon, min 18°C on Tue night). Mainly strong winds. | Days 4-6 Weather SummaryHeavy rain (total 54mm), heaviest during Thu morning. Warm (max 24°C on Thu afternoon, min 17°C on Sat morning). Winds increasing (calm on Fri morning, fresh winds from the NNE by Sat morning). | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 8 | SE 8 | SE 7 | E 5 | ESE 6 | ESE 6 | ESE 7 | ESE 6 | SE 9 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | SSW 6 | SSW 6 | E 8 | SSW 7 | E 10 | E 9 | ENE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 23 | 17 | 14 | 12 | 97 | 186 | 186 | 158 | 85 | 50 | 88 | 56 | 27 | 16 | 32 | 16 | 10 | 9 | 33 | 43 | 163 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross | off | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross |
High Tide | 10:23AM0.99m | 10:44PM0.88m | 11:05AM1.00m | 11:30PM0.83m | 11:52AM0.99m | 00:21AM0.77m | 12:48PM0.97m | 1:21AM0.73m | 1:55PM0.95m | 2:32AM0.71m | 3:13PM0.94m | 3:50AM0.73m | 4:30PM0.96m | ||||||||
Low Tide | 4:38PM0.06m | 4:27AM0.03m | 5:25PM0.09m | 5:08AM0.05m | 6:26PM0.13m | 5:56AM0.08m | 7:52PM0.16m | 6:55AM0.10m | 9:21PM0.17m | 8:08AM0.12m | 10:31PM0.14m | 9:43AM0.11m | 11:29PM0.10m | ||||||||
 | |  |  |  |  | | | | |  |  | | |  | | | | | | | |
 | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 7:21 | — | — | 7:19 | — | — | 7:17 | — | — | 7:15 | — | — | 7:14 | — | — | 7:13 | — | — | 7:10 | — |
mm | — | — | 4 | 4 | 14 | — | — | — | 5 | 48 | — | 6 | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 21 | 21 | 21 | 22 | 19 | 19 | 20 | 22 | 23 | 24 | 23 | 21 | 24 | 24 | 18 | 20 | 20 | 18 | 21 | 20 |
Feels °C | 19 | 21 | 21 | 22 | 25 | 15 | 15 | 17 | 21 | 24 | 24 | 25 | 23 | 22 | 23 | 13 | 13 | 14 | 13 | 15 | 17 |
Swell 1 Height (m) Direction Period (s) | SSW 5 | SSW 5 | SE 8 | SE 7 | SE 13 | SE 12 | SE 11 | SE 10 | SE 9 | ESE 6 | ESE 8 | SSW 5 | ESE 7 | ESE 7 | SSW 6 | SSW 6 | SSW 6 | SSW 7 | E 10 | E 9 | ENE 10 |
| kJ | 16 | 9 | 14 | 12 | 7 | 37 | 94 | 48 | 51 | 29 | 88 | 28 | 27 | 16 | 32 | 16 | 7 | 9 | 33 | 43 | 163 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 8 | SSW 4 | SW 4 | — | SW 4 | — | — | SW 5 | SE 9 | E 7 | ESE 8 | SSW 5 | SE 8 | ESE 7 | ESE 8 | E 8 | SE 9 | SSW 7 | SSW 6 | SE 9 |
| kJ | 23 | 17 | 2 | 1 | — | 1 | — | — | 1 | 50 | 25 | 56 | 9 | 11 | 9 | 12 | 10 | 3 | 9 | 4 | 3 |
Swell 3 Height (m) Direction Period (s) | WSW 5 | ENE 2 | — | SE 14 | SE 10 | — | — | — | — | E 6 | — | E 7 | SE 8 | S 8 | SE 8 | WNW 4 | SE 8 | S 7 | SE 9 | SE 9 | S 6 |
| kJ | 4 | 1 | — | 8 | 4 | — | — | — | — | 12 | — | 23 | 11 | 1 | 10 | 3 | 9 | 1 | 3 | 3 | 1 |
Wind waves Height (m) Direction Period (s) | NNE 3 | — | — | ESE 2 | E 5 | ESE 6 | ESE 6 | ESE 7 | ESE 6 | S 4 | SSW 5 | NW 2 | NW 3 | WSW 4 | NW 4 | NNE 4 | NE 5 | NE 5 | NE 6 | NE 6 | — |
| kJ | 1 | — | — | 1 | 97 | 186 | 186 | 158 | 85 | 20 | 48 | 2 | 3 | 21 | 20 | 12 | 15 | 107 | 181 | 80 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 791 | 634 | 249 | 702 | 445 | 357 | 645 | 373 | 277 | 198 | 26 | 24 | 49 | 85 | 85 | 847 | 130 | 157 | 141 | 130 | 26 |
Best forecast wave conditions in Rhode Island | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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.
Nearest