Surf Forecasts:
Block Island surf forecast from 3 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 8AM (local time) - 6.5ft (2.0m), 8s period, SSW swell with 452 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 2.0m 8s and forecast to arrive on Thursday (Sep 10) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Sunday (Sep 06) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Thu 10th Sep) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Hey folks, Rusty here. Let’s talk Block Island. Straight up—this outlook is a tough one. The finder shows zero decent surf for the whole 16-day stretch. Every single time slot has “poor surf conditions” and scores that aren’t worth repeating. That’s not a surprise for Block Island, a point break that “rarely breaks” at the best of times. So we’re looking at a long, quiet run.
Thursday 3rd September kicks off with some clouds, cross‑onshore winds around 12 mph and tiny 2 ft SE swell at 9 seconds. Combined energy is weak at 85. Water temp is 69°F, pretty normal for this time of year. The whole day stays rubbish, with afternoon thunderstorms adding to the mess. Friday 4th goes glassy in the morning (1 ft SE, 8 sec, energy 50) but still no wave quality—just flat and featureless. Saturday 5th brings clean cross‑offshore winds but the swell is mostly gone (1 ft, 8 sec, energy 35). Sunday 6th has a fresh NNE breeze and a tiny 1 ft SSW swell, energy only 20. Monday 7th gives a clean morning with 2 ft E swell at a longer 11 seconds, energy 87, but it’s still poor surf.
The only flicker of size comes Thursday 10th September, when the swell jumps to 7 ft from SSW/SW at 8 seconds, combined energy around 491 – that’s moderate energy. But the winds are cross‑shore at 16 mph, creating a lumpy cross‑chop. That’s too big and messy for a rarely‑breaking point, and honestly it looks more interesting for kite surfing than paddle surfing. After that the sizes drop back to scraps, with occasional clean mornings but swell heights under 3 ft. The last few days of the forecast (mid‑September) see tiny 1–1 ft SE groundswell with periods up to 12 seconds, but energy is low (40s) and cross‑onshore winds keep it choppy.
Bottom line: if you’re hoping for a session on Block Island in the next two and a half weeks, you’re gonna be disappointed. This spot simply doesn’t fire often, and this forecast is a perfect example of that. Forecasts can change, but for now, leave the board at home.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Thu morning. Warm (max 26°C on Fri night, min 16°C on Sat night). Winds increasing (calm on Fri morning, fresh winds from the NNE by Sat night). | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Tue afternoon, min 15°C on Sun morning). Mainly fresh winds. | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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 9 | SE 9 | SSW 5 | SE 8 | SE 8 | SE 8 | ESE 8 | SSW 6 | SSW 8 | SSW 6 | ENE 6 | E 11 | E 11 | E 11 | E 10 | E 9 | WSW 4 | SW 5 | SW 5 | SSW 5 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 50 | 49 | 24 | 23 | 23 | 16 | 22 | 13 | 32 | 17 | 48 | 89 | 81 | 55 | 48 | 15 | 16 | 15 | 18 | 23 | 44 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | glassy | cross-on | off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-on | cross | cross-off | cross | cross | cross-on | on | cross-on |
High Tide | 12:48PM0.97m | 1:21AM0.73m | 1:55PM0.95m | 2:32AM0.71m | 3:13PM0.94m | 3:50AM0.73m | 4:30PM0.96m | 5:02AM0.80m | 5:35PM0.99m | 6:03AM0.88m | 6:31PM1.01m | 6:57AM0.97m | 7:21PM1.02m | ||||||||
Low Tide | 7:52PM0.16m | 6:55AM0.10m | 9:21PM0.17m | 8:08AM0.12m | 10:31PM0.14m | 9:43AM0.11m | 11:29PM0.10m | 11:08AM0.07m | 00:20AM0.05m | 12:13PM0.02m | 1:06AM0.01m | 1:09PM-0.02m | 1:47AM-0.02m | ||||||||
 | |  |  |  | | |  |  | | |  | | | | | | |  |  | | |
 | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — |
 | — | 7:15 | — | — | 7:14 | — | — | 7:13 | — | — | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:06 | — |
mm | 1 | 1 | 2 | — | — | 1 | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 3 |
Temp °C | 22 | 23 | 24 | 22 | 24 | 26 | 21 | 21 | 20 | 18 | 20 | 19 | 20 | 21 | 21 | 22 | 24 | 21 | 19 | 20 | 21 |
Feels °C | 23 | 23 | 25 | 25 | 25 | 26 | 19 | 20 | 16 | 12 | 14 | 16 | 17 | 19 | 18 | 19 | 20 | 19 | 17 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | SE 5 | SE 9 | SSW 5 | SSW 5 | ESE 7 | SE 8 | SSW 6 | SSW 6 | SSW 8 | SSW 6 | SSW 6 | E 11 | E 11 | E 11 | E 10 | SW 4 | E 9 | SW 5 | SW 5 | SSW 5 | SE 9 |
| kJ | 21 | 49 | 23 | 13 | 15 | 16 | 13 | 13 | 32 | 17 | 8 | 89 | 81 | 55 | 48 | 10 | 14 | 15 | 18 | 23 | 13 |
Swell 2 Height (m) Direction Period (s) | SE 9 | ESE 5 | SE 8 | SE 8 | SE 8 | ESE 6 | ESE 8 | SE 8 | SE 9 | SE 9 | SE 9 | ENE 4 | SE 9 | SE 8 | SE 8 | E 9 | SE 9 | E 8 | SE 10 | SE 10 | E 4 |
| kJ | 50 | 11 | 24 | 23 | 23 | 8 | 22 | 9 | 12 | 3 | 3 | 6 | 3 | 3 | 3 | 15 | 3 | 6 | 15 | 15 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | E 6 | E 7 | S 8 | SW 4 | — | E 7 | — | — | SE 9 | SSW 6 | SSW 6 | SE 8 | SW 6 | SE 9 | — | SE 9 | E 9 | ENE 4 | E 9 |
| kJ | — | — | 7 | 14 | 1 | 5 | — | 8 | — | — | 3 | 3 | 3 | 3 | 1 | 3 | — | 3 | 6 | 2 | 1 |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | — | — | SW 5 | NW 3 | NNE 4 | ENE 5 | ENE 5 | NE 6 | ENE 6 | — | NW 3 | SW 3 | WSW 4 | NW 3 | WSW 4 | — | SE 3 | — | SSW 6 |
| kJ | 14 | 29 | — | — | 12 | 2 | 11 | 16 | 46 | 69 | 48 | — | 1 | 5 | 13 | 1 | 16 | — | 3 | — | 44 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 195 | 219 | 25 | 29 | 198 | 159 | 249 | 256 | 170 | 1696 | 130 | 24 | 24 | 82 | 131 | 159 | 767 | 156 | 665 | 3423 | 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.
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