Surf Forecasts:
Block Island surf forecast from 14 Sep 2026:
- Most powerful swell: Monday 21 Sep, 2PM (local time) - 5ft (1.6m), 6s period, E swell with 177 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 1.6m 6s and forecast to arrive on Monday (Sep 21) 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 1.4m 6s period and expected on Monday (Sep 21) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Mon 21st Sep) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright, let's get real about Block Island. This one’s a tough nut.
Honestly, the whole 16-day window is a write-off for decent surf. We’re looking at tiny waves, messy winds, and just straight-up poor conditions every single day. The first recommendation doesn’t even pop up until September 14th, and from there, it’s a long stretch of nothing good. You’ll see a gap of several days with no real hope. The only standout, if you can call it that, is a brief pulse around September 20th, but even that is a struggle.
Block Island (point) is your only break on offer, and it’s a spot that *rarely breaks* as it is. The water temp is 68°F, which feels about average for the time of year—no big anomaly to get excited about.
For Monday, September 20th, there’s a small window of hope. The morning sees a 4ft swell from the SW, with a fresh NNE breeze blowing cross-offshore—that’ll keep the surface clean. Combined wave energy reads (120), which is moderate, but the swell period is short at 6 seconds, meaning it’ll be weak and a bit choppy underneath. The afternoon drops to 3ft, still clean but even smaller. This is the best on offer, but it’s still poor overall.
After that, we get a bump in size but it’s all onshore junk. Wednesday, September 23rd sees 7ft ESE swell but under a bone-on SE wind, making for a messy, blown-out mess. The energy hits (472), so there’s power, but the quality is zero. That’s more of a kite-surfing setup than a paddle session.
The rest of the period is tiny, cross-shore, or onshore slop. Another small cleanup happens right at the end on September 27th and 28th with a NNW offshore, but the swell is puny at 1ft to 2ft. Not worth the paddle.
If you’re a beginner, it’s not going to be good for you either—when the swell gets over 5ft, it’s too much for learning, and when it’s under, there’s just no wave.
Bottom line: Block Island is flipping the bird at us this 16 days. One or two clean-ish moments, but mostly a blank run. It happens.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon morning. Warm (max 23°C on Mon afternoon, min 14°C on Tue morning). Winds decreasing (fresh winds from the NNW on Mon morning, calm by Tue night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Warm (max 24°C on Fri afternoon, min 18°C on Sat morning). Winds increasing (light winds from the W on Thu morning, strong winds from the S by Sat night). | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 8 | SE 8 | SE 9 | E 4 | E 5 | ESE 5 | E 7 | ESE 8 | E 8 | ESE 7 | ESE 7 | SW 4 | SE 12 | SE 12 | SE 8 | SE 8 | SSW 5 | SW 6 | SSW 6 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 27 | 35 | 24 | 13 | 10 | 11 | 8 | 27 | 33 | 29 | 17 | 15 | 14 | 22 | 21 | 18 | 17 | 68 | 86 | 60 | 21 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross | cross-on | glassy | cross-on | cross-on | cross | cross-on | cross-on | cross | off | on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | off |
High Tide | 10:41AM1.01m | 10:54PM0.80m | 11:24AM0.95m | 11:35PM0.73m | 12:09PM0.88m | 00:20AM0.66m | 1:03PM0.82m | 1:13AM0.61m | 2:11PM0.77m | 2:30AM0.59m | 3:24PM0.75m | 3:49AM0.61m | 4:27PM0.76m | 4:52AM0.66m | |||||||
Low Tide | 4:59PM0.09m | 4:21AM0.11m | 5:46PM0.16m | 4:52AM0.16m | 6:44PM0.22m | 5:32AM0.20m | 7:58PM0.27m | 6:24AM0.25m | 9:08PM0.29m | 7:41AM0.28m | 10:08PM0.27m | 9:50AM0.27m | 10:58PM0.24m | ||||||||
 |  |  | | | | |  | | | |  | | | |  | |  |  | | | |
 | 6:24 | — | — | 6:26 | — | — | 6:26 | — | — | 6:28 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — |
 | — | 6:58 | — | — | 6:55 | — | — | 6:53 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:46 | — |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — |
Temp °C | 20 | 23 | 21 | 15 | 16 | 16 | 16 | 18 | 20 | 20 | 21 | 21 | 22 | 24 | 21 | 19 | 20 | 22 | 20 | 18 | 18 |
Feels °C | 15 | 18 | 16 | 12 | 14 | 14 | 16 | 16 | 19 | 20 | 19 | 19 | 23 | 24 | 18 | 17 | 17 | 17 | 21 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | S 6 | SE 8 | SE 8 | SE 9 | ESE 9 | E 5 | ESE 5 | E 7 | ESE 8 | E 8 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 6 | SE 8 | SE 8 | SE 11 | SW 6 | SSW 6 | SSW 6 |
| kJ | 18 | 35 | 24 | 13 | 8 | 11 | 8 | 27 | 33 | 29 | 17 | 15 | 4 | 9 | 8 | 18 | 17 | 18 | 86 | 60 | 21 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SSW 6 | S 6 | SSW 6 | SSW 6 | ESE 9 | E 7 | SE 10 | SE 13 | SE 12 | SE 12 | ESE 12 | E 6 | SE 9 | SW 4 | ESE 6 | ESE 11 | ESE 7 | SE 11 | SE 10 | SE 9 |
| kJ | 27 | 11 | 7 | 8 | 3 | 8 | 4 | 4 | 7 | 6 | 6 | 15 | 3 | 12 | 2 | 3 | 12 | 10 | 29 | 17 | 14 |
Swell 3 Height (m) Direction Period (s) | SE 5 | WNW 3 | S 6 | SSE 6 | S 7 | E 7 | SE 9 | SE 13 | — | — | SE 9 | SE 9 | ESE 9 | SE 12 | SE 12 | ESE 12 | — | — | ESE 7 | ESE 7 | — |
| kJ | 4 | 1 | 1 | 3 | 1 | 3 | 3 | 7 | — | — | 3 | 3 | 8 | 22 | 21 | 13 | — | — | 5 | 5 | — |
Wind waves Height (m) Direction Period (s) | NNW 4 | NNW 3 | NNE 4 | ENE 5 | E 4 | — | — | — | SW 3 | WSW 3 | SW 2 | SW 3 | SW 4 | SW 4 | — | E 2 | SE 3 | SSW 5 | — | NE 4 | ENE 6 |
| kJ | 13 | 3 | 26 | 38 | 10 | — | — | — | 1 | 1 | 1 | 7 | 14 | 9 | — | 1 | 5 | 68 | — | 32 | 122 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 163 | 49 | 249 | 642 | 767 | 767 | 1148 | 1148 | 49 | 159 | 749 | 415 | 49 | 85 | 674 | 709 | 769 | 748 | 24 | 25 | 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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