Surf Forecasts:
Block Island surf forecast from 31 Aug 2026:
- Best quality surf: Monday 7 Sep, 5AM (local time) - 3ft (0.9m), 10s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 8AM (local time) - 7ft (2.1m), 6s period, NE swell with 317 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 5AM (local time) - 3ft (0.9m), 10s period with E swell.
Best Forecast Surf Conditions for Block Island this week:
The surf forecast for Block Island over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 07) at 5AM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.1m and 9s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Block Island in the next 16 days are 2.1m 6s and forecast to arrive on Sunday (Sep 06) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Sunday (Sep 06) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 7th Sep) | 3ft (0.9m) 10s |
| Best Surf | 5AM (Mon 7th Sep) | 3ft (0.9m) 10s |
| Most Powerful | 8AM (Sun 6th Sep) | 7ft (2.1m) 6s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let me level with you straight up about Block Island. This is a rare-break point that really needs everything to line up, and for the next 16 days… well, it’s a tough stretch.
The whole run starts with a long, slow grind. From the 31st of August right through to the morning of the 4th of September, there’s simply nothing doing – flat, wind-ruined, or both. We’re talking days of nothing. The combined wave energy is tanking, barely hitting 39 (weak) at best, with tiny 1ft windswell bumping into onshore breezes. It’s a write-off.
Wednesday the 2nd of September sees a bit of a bump, with a 6ft swell from the ESE and a period of 6 seconds, but the wind is a fresh cross-onshore at 19 mph, turning it into a lumpy, choppy mess. The energy hits 277 (moderate), but the quality is just not there for a point break. That’s more of a kite-surfing setup, honestly.
The first real glimmer, and I mean a glimmer, comes on the morning of Friday the 4th of September. We’ve got glassy conditions with a light NNE breeze, and a tiny 2ft swell from the ESE. The energy is still low at 44 (weak), and the period is a short 6 seconds, so it’s not going to be anything memorable. But it’s clean. For a spot that rarely breaks, even a clean 2ft wave is a session saver.
Then we get another blank spell until the 6th of September. Sunday morning the 6th brings a 6ft bump from the NE with a short 6-second period, and the wind is a clean cross-off at 25 mph. The energy is moderate at 276, but the swell direction (NE) is not the optimum (SE) for the break, and that short period means it’ll be a bit walled up and unruly.
The standout window, for what it’s worth, is the 7th of September. Monday morning gives us a 3ft groundswell from the E with a long 11-second period, putting the energy at 170 (moderate). The wind is a light, clean cross-off from the NE. This is the best we’ve got. The longer period suggests better shape, but the size is tiny. It’s surfable, but very ordinary. The water temperature is 70°, which is about normal for this time of year.
The next slight uptick is the 9th of September. Wednesday morning we see glassy conditions with a 5ft swell from the SSW with a 7-second period, and the energy is a solid 254 (moderate). The wind stays glassy right through the afternoon. The swell is a bit too small to get really excited about, and the direction is SSW, not the preferred SE, but clean, glassy waves at a point break are a rare treat. This is the best on offer in the whole outlook, but it’s still a long way off.
Beyond that, the 10th of September onward fades out into small, wind-affected leftovers. The energy drops back into the double digits, and we’re back to tiny 1.0ft dribblers with cross-shore wind. It’s a grim end to the run.
So, to call it: the 7th of September is the pick for the patient surfer, with that long-period groundswell and clean wind. The 9th of September is the closest thing to a standout, with glassy conditions and a moderate amount of energy. Everything else is a tough sell. For a break that rarely breaks, this is a pretty ordinary window.
Stay safe, stay patient.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Tue morning. Warm (max 22°C on Mon afternoon, min 19°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Thu morning. Warm (max 26°C on Fri afternoon, min 16°C on Sat night). Winds increasing (calm on Fri morning, strong winds from the NNE by Sat night). | ||||||||||||||||||||
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 | SE 8 | ESE 6 | ESE 6 | SE 7 | SE 6 | SE 6 | SSW 5 | ESE 7 | ESE 6 | ESE 6 | SSW 6 | SSW 6 | SE 8 | SSW 6 | NE 6 | ENE 6 | E 10 |
Wave Graph | |||||||||||||||||||||
23 | 17 | 14 | 12 | 17 | 155 | 220 | 189 | 123 | 61 | 35 | 59 | 27 | 16 | 33 | 15 | 9 | 3 | 236 | 131 | 177 | |
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 | cross-on | cross-on | cross-on | on | cross | cross-off | glassy | cross | off | off | cross-off | cross-off | cross-off | cross-off | cross-off |
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 | — | — | 3 | 5 | 5 | 2 | — | — | 2 | 15 | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 22 | 22 | 21 | 21 | 20 | 20 | 20 | 22 | 22 | 23 | 25 | 22 | 26 | 26 | 21 | 23 | 19 | 17 | 18 | 18 |
Feels °C | 19 | 22 | 22 | 22 | 23 | 17 | 16 | 17 | 21 | 21 | 22 | 26 | 24 | 25 | 24 | 17 | 22 | 13 | 10 | 11 | 13 |
Swell 1 Height (m) Direction Period (s) | SSW 5 | SSW 5 | SE 8 | SE 7 | SE 8 | SE 12 | SE 11 | SE 10 | SE 9 | SE 9 | SE 6 | SW 5 | ESE 6 | ESE 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | E 10 | SE 9 | E 10 |
16 | 9 | 14 | 12 | 17 | 71 | 57 | 49 | 53 | 50 | 33 | 31 | 27 | 16 | 33 | 15 | 7 | 3 | 33 | 3 | 177 | |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 8 | SSW 4 | ESE 4 | E 4 | — | — | — | SSW 5 | — | SE 9 | ESE 7 | SW 5 | SSW 5 | SE 8 | SE 8 | SE 8 | SE 9 | SSW 6 | SW 6 | SE 9 |
23 | 17 | 2 | 1 | 1 | — | — | — | 2 | — | 27 | 59 | 6 | 9 | 16 | 10 | 9 | 3 | 4 | 1 | 3 | |
Swell 3 Height (m) Direction Period (s) | WSW 5 | NE 3 | — | SW 4 | SE 13 | — | — | — | — | — | — | SE 8 | SE 8 | SE 8 | E 7 | W 4 | E 7 | S 6 | SE 9 | — | S 6 |
4 | 2 | — | 1 | 7 | — | — | — | — | — | — | 25 | 11 | 11 | 1 | 1 | 4 | 1 | 3 | — | 1 | |
Wind waves Height (m) Direction Period (s) | NE 3 | E 3 | SE 3 | — | E 5 | ESE 6 | ESE 6 | SE 7 | SE 6 | SE 6 | SSW 5 | W 5 | WNW 3 | W 4 | NW 3 | N 3 | NE 5 | NE 5 | NE 6 | ENE 6 | — |
2 | 1 | 2 | — | 11 | 155 | 220 | 189 | 123 | 61 | 35 | 15 | 8 | 14 | 9 | 6 | 22 | 126 | 236 | 131 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 769 | 702 | 249 | 702 | 445 | 182 | 612 | 1156 | 25 | 219 | 195 | 24 | 29 | 49 | 189 | 634 | 634 | 2371 | 157 | 130 | 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.











