Surf Forecasts:
Block Island surf forecast from 11 Sep 2026:
- Most powerful swell: Tuesday 15 Sep, 8PM (local time) - 3ft (0.9m), 7s period, E swell with 81 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 0.9m 7s and forecast to arrive on Tuesday (Sep 15) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Tuesday (Sep 15) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Tue 15th Sep) | 3ft (0.9m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's be straight with you: this stretch of the next two weeks is looking pretty bleak for us. We got a long gap of real surf on offer, and it’ll take a while for anything decent to show its face. Don’t get your hopes up for the near term, 'cause we're in for a flat spell.
The first real window is a long way off. We're looking at a solid stretch of nothing from now until September 23rd. There will be some small bumps of energy, but nothing with any push or shape. It's going to be a test of patience. The water temp is sitting at 69°F, which is about average for this time of year, so no surprises there.
Now, for the first real standout. We finally see something pulse through on the morning of Wednesday, September 23rd. Block Island (Block-Island) is the spot to watch. We're looking at a clean 5ft of southeast swell, with a period of 8 seconds. The cross-offshore wind from the northeast will have it looking proper. The energy is moderate at 268, but the quality should be there. The fact that this break rarely breaks makes this worth the wait. It's an intermediate-level wave and you may get some company, so be ready.
The swell builds through that afternoon, hitting 5ft, and the energy jumps to a moderate 331. Still clean with those northeast cross-offshore winds. This looks like the best bet on the board right now. From a surfing standpoint, it’s as good as it gets for this stretch.
Thursday, September 24th gets bigger, but the wind goes onshore. Morning has 6ft of east swell and a cross-shore wind making things lumpy, and by the afternoon, it jumps to a powerful 10ft, but with a messy cross-chop. This is expert territory only, and the wind will likely make it unruly. The energy is strong at 801. This one's for the chargers only, if it's even makeable.
Then Friday, September 25th comes in with some size and a little more hope. Morning sees a 8ft east swell with a 9-second period, and the energy is a hefty 1211. Strong stuff. It's marked as marginal due to tide, and the light cross-shore wind could keep it clean-ish, but this is still big for the average punter. The afternoon drops to 8ft but the wind picks up from the northeast to 35 km/h, creating a clean but powerful cross-off. The energy is strong at 1055, but this is still only for the experienced crew. Keep in mind, this one is still a week and a half away, so treat that call with a bit of caution.
After that, it backs off again. The 26th sees the swell drop to a still-chunky 5ft, but the winds and energy fade with it. It's clean but not as powerful.
So there you have it. A long drought before some proper, albeit big, surf shows up around the 23rd. Mark your calendars, but keep your expectations in check until we get closer. The setup could be interesting for kitesurfing on the 24th with that strong onshore wind and substantial swell, but for a paddle, it's a no-go for most.
Stay patient.
Rusty
Short Range ForecastHeavy rain (total 59mm), heaviest during Sun morning. Warm (max 23°C on Fri afternoon, min 17°C on Sat morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Mon afternoon, min 12°C on Tue night). Winds decreasing (fresh winds from the NE on Mon night, light winds from the ESE by Wed afternoon). | |||||||||||||||||||
Fri 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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 | SSW 6 | SE 9 | SE 10 | SE 10 | SSE 5 | SSE 5 | SSE 6 | SE 6 | SE 7 | SE 8 | ESE 9 | ENE 5 | E 8 | E 8 | E 8 | E 8 | E 7 | SW 4 | SW 5 |
Wave Graph  | ||||||||||||||||||||
 kJ | 26 | 26 | 14 | 15 | 24 | 43 | 39 | 42 | 39 | 39 | 15 | 8 | 42 | 54 | 61 | 66 | 48 | 28 | 24 | 64 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross | on | on | cross-on | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 8:50PM0.98m | 9:16AM1.09m | 9:33PM0.93m | 9:59AM1.06m | 10:14PM0.87m | 10:41AM1.01m | 10:54PM0.80m | 11:24AM0.95m | 11:35PM0.73m | 12:09PM0.88m | 00:20AM0.66m | 1:03PM0.82m | 1:13AM0.61m | |||||||
Low Tide | 2:47PM-0.03m | 2:59AM-0.02m | 3:32PM-0.01m | 3:29AM0.02m | 4:16PM0.04m | 3:55AM0.06m | 4:59PM0.09m | 4:21AM0.11m | 5:46PM0.16m | 4:52AM0.16m | 6:44PM0.22m | 5:32AM0.20m | 7:58PM0.27m | |||||||
 |  | |  |  |  | | |  | | | | | | | | | | | | |
 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:26 | — | — | 6:28 | — | — |
 | 7:02 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:55 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | — | 33 | 17 | — | 9 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 18 | 21 | 22 | 22 | 21 | 21 | 20 | 21 | 20 | 16 | 17 | 15 | 14 | 17 | 17 | 17 | 19 | 21 |
Feels °C | 19 | 20 | 16 | 21 | 20 | 21 | 23 | 22 | 18 | 20 | 17 | 11 | 12 | 10 | 11 | 17 | 16 | 16 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SSW 6 | SSW 5 | SE 10 | SSE 5 | SSE 5 | SE 9 | SE 6 | SE 7 | SE 8 | ESE 9 | ESE 9 | E 8 | E 8 | E 8 | E 8 | E 7 | ESE 7 | E 6 |
| kJ | 26 | 26 | 13 | 6 | 24 | 43 | 39 | 29 | 39 | 39 | 15 | 8 | 8 | 54 | 61 | 66 | 48 | 28 | 16 | 3 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 9 | SE 10 | S 9 | SE 10 | SE 9 | SE 9 | SW 5 | SSW 6 | ESE 9 | SE 6 | S 6 | SE 14 | SE 13 | SE 13 | SE 13 | SE 12 | SE 12 | ESE 8 |
| kJ | 13 | 13 | 14 | 15 | 2 | 33 | 30 | 28 | 11 | 10 | 8 | 2 | 1 | 7 | 7 | 7 | 7 | 6 | 6 | 6 |
Swell 3 Height (m) Direction Period (s) | — | SSE 6 | SSE 6 | SE 6 | — | — | — | S 10 | — | W 3 | SSW 5 | S 6 | S 15 | S 6 | S 6 | S 5 | — | — | SE 9 | SE 12 |
| kJ | — | 4 | 4 | 1 | — | — | — | 2 | — | 1 | 3 | 3 | 4 | 1 | 1 | 1 | — | — | 3 | 6 |
Wind waves Height (m) Direction Period (s) | WSW 3 | — | NE 3 | — | SSE 4 | — | — | SSE 6 | NNE 3 | NNE 3 | NE 5 | ENE 5 | ENE 5 | — | — | W 5 | SW 2 | SW 3 | SW 4 | SW 5 |
| kJ | 1 | — | 1 | — | 17 | — | — | 42 | 3 | 1 | 60 | 72 | 42 | — | — | 1 | 1 | 3 | 24 | 64 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 645 | 702 | 1156 | 1158 | 249 | 185 | 29 | 24 | 163 | 85 | 634 | 182 | 1095 | 156 | 156 | 992 | 138 | 371 | 1655 | 415 |
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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