Surf Forecasts:
Block Island surf forecast from 5 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 5AM (local time) - 10ft (3.0m), 8s period, SW swell with 1,001 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 3.0m 8s and forecast to arrive on Thursday (Sep 10) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s 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 | 5AM (Thu 10th Sep) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, let’s cut through it. For Block Island over the next 16 days, it’s a real struggle to find any decent surf. The data keeps throwin’ “poor surf conditions” at us, and the scores back it up. It’s a long stretch of flat to weak, wind-affected junk.
The one and only time it might get your heart goin’ is on Thursday, September 10th. That morning, a 7.2ft southwest swell shows up with a combined energy of 623 – that’s a lot of juice. The wind is a cross-offshore from the west at 19 mph, which should keep the surface clean. But this is a point break that rarely breaks anyway, and at that size it’s strictly for the experts. The swell period is only 8 seconds, so it’s a short, choppy wind swell, not the clean lines you’d hope for. The afternoon drops to 5.9ft (combined energy 378) and the wind picks up. Still, that Thursday morning is the only real standout.
For the rest of the time, from the 5th through the 9th, you’ve got tiny waves under 3ft with winds that are mostly cross-shore or onshore. The water temp on the 5th morning is a normal 69° for this time of year, just 0.2° off average. After the 10th, it’s all back to tiny, messy, wind-blown surf through the second week, with combined energy readings mostly below 100. For a spot that’s rarely on, this is a long, quiet spell. Don’t hold your breath, mate. Forecasts can flip, but this one’s lookin’ rough.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat afternoon. Warm (max 24°C on Mon night, min 16°C on Sun morning). Winds decreasing (fresh winds from the NE on Sat night, calm by Sun afternoon). | Days 4-6 Weather SummarySome drizzle, heaviest during Wed night. Warm (max 25°C on Thu afternoon, min 15°C on Thu night). Winds increasing (light winds from the SSW on Tue afternoon, near gales from the SW by Wed night). | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
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) | SSW 6 | E 7 | ENE 5 | E 8 | E 7 | E 9 | E 10 | E 10 | E 10 | E 9 | E 9 | SE 9 | SW 4 | SW 5 | SW 7 | SW 8 | SW 8 | SSW 7 | SSW 7 | SSW 6 | S 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 11 | 15 | 36 | 11 | 39 | 27 | 31 | 31 | 28 | 15 | 14 | 12 | 11 | 140 | 821 | 609 | 350 | 124 | 50 | 21 | 29 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-on | off | off | cross-on | off | off | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | off | off | cross-on | cross-off |
High Tide | 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 | 7:46AM1.04m | 8:07PM1.01m | 8:32AM1.08m | 8:50PM0.98m | ||||||||
Low Tide | 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 | 2:00PM-0.03m | 2:25AM-0.03m | 2:47PM-0.03m | 2:59AM-0.02m | |||||||
 |  |  | |  |  | | |  | | | |  | | | | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — |
 | — | 7:13 | — | — | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:06 | — | — | 7:04 | — | — | 7:02 | — |
mm | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 21 | 22 | 19 | 17 | 18 | 19 | 20 | 23 | 24 | 21 | 22 | 23 | 22 | 22 | 23 | 23 | 25 | 23 | 15 | 20 | 20 |
Feels °C | 20 | 22 | 14 | 12 | 17 | 16 | 17 | 21 | 22 | 19 | 21 | 21 | 21 | 19 | 17 | 19 | 21 | 19 | 9 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | E 7 | SE 9 | E 8 | E 7 | E 9 | E 10 | E 10 | E 10 | E 9 | E 9 | SE 9 | SE 8 | SE 10 | ESE 9 | SE 9 | SE 9 | SSW 7 | SSW 7 | SSW 6 | S 8 |
| kJ | 11 | 15 | 12 | 11 | 39 | 27 | 31 | 31 | 28 | 15 | 14 | 12 | 3 | 15 | 8 | 14 | 14 | 124 | 50 | 21 | 29 |
Swell 2 Height (m) Direction Period (s) | E 6 | SSW 5 | SSW 6 | SSW 6 | E 9 | SSE 9 | SE 9 | SSE 8 | SW 3 | SSE 9 | SSE 9 | E 9 | E 9 | E 9 | E 9 | — | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 |
| kJ | 7 | 6 | 4 | 3 | 15 | 8 | 12 | 7 | 2 | 8 | 8 | 6 | 6 | 2 | 1 | — | 14 | 15 | 15 | 15 | 14 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SE 8 | E 8 | SE 9 | SSW 6 | SSW 6 | S 5 | S 5 | SSE 8 | S 5 | SW 5 | S 6 | SE 10 | — | — | — | — | W 4 | — | — | SE 11 |
| kJ | 9 | 9 | 5 | 3 | 3 | 3 | 2 | 1 | 7 | 1 | 1 | 1 | 4 | — | — | — | — | 2 | — | — | 5 |
Wind waves Height (m) Direction Period (s) | N 3 | NE 3 | ENE 5 | ENE 5 | — | WSW 3 | N 3 | SW 3 | — | W 4 | SW 3 | SW 4 | SW 4 | SW 5 | SW 7 | SW 8 | SW 8 | NW 4 | NNE 4 | ENE 3 | E 4 |
| kJ | 1 | 2 | 36 | 36 | — | 1 | 1 | 2 | — | 2 | 4 | 6 | 11 | 140 | 821 | 609 | 350 | 10 | 13 | 5 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 912 | 2583 | 157 | 157 | 85 | 85 | 49 | 131 | 49 | 49 | 1814 | 608 | 665 | 1095 | 1148 | 25 | 25 | 26 | 49 | 49 | 49 |
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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