Surf Forecasts:
Block Island surf forecast from 18 Aug 2026:
- Most powerful swell: Monday 24 Aug, 5PM (local time) - 3.5ft (1.1m), 7s period, S swell with 117 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 1.1m 7s and forecast to arrive on Monday (Aug 24) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Saturday (Aug 22) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Mon 24th Aug) | 3.5ft (1.1m) 7s |
Table - best surf conditions forecast for Block Island over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s shaping up for Block Island. To be honest, the next week and a bit is a write-off. We’ve got a long stretch of tiny, weak, and messy conditions from now through the 23rd of August. The swell is small, the periods are short, and the wind is all over the shop – mostly cross or cross-on. It’s a real bummer, with most days showing combined swell energy barely cracking 100 (mostly well under). There’s just nothing to get excited about.
Things finally start to flicker to life on Monday the 24th of August. The morning sees a little lift, with a 4ft S swell mixing with a light cross-offshore breeze from the W. The combined energy jumps to 158 (moderate), and the conditions are clean. It’s not a standout, but it’s the first sign of life after a long, flat spell.
The first real standout comes on Tuesday the 25th of August. The morning at Block Island is looking like the pick of the whole outlook. We’ve got a 5ft SSW swell with a clean 7-second period, and the wind is a light NNE cross-offshore. The water temperature is about average for this time of year. The combined energy hits 204 (moderate), and the forecast is for good surf. This is a proper session for the intermediate crew, with clean, peeling waves at the point. It’s not huge, but it’s quality.
The rest of the outlook is a mixed bag of onshore wind and lumpy conditions. There’s a pulse of bigger swell late on the 28th and 29th of August, with 6ft to 6ft S swell, but it’s blown out by moderate to fresh cross-shore winds. The combined energy gets up into the 450s (strong), but it’s a mess. Good for kites, not so much for paddling.
Then, on the 31st of August, there’s another glimmer. The Monday morning shows a 5ft ENE swell, with glassy conditions. The combined energy is 202 (moderate). That’s another good bet for the early crew, but the afternoon gets churned up again.
Looking way out, the 1st of September Tuesday afternoon has a promising setup: a 4ft SSE swell with glassy conditions and a combined energy of 234 (moderate). That’s a long-range call, so keep an eye on it, but it could be a nice surprise.
All in all, don’t waste your time this week. Save your energy for the Tuesday morning (25th of August) session. That’s the one to circle.
Rusty.
Short Range ForecastSome drizzle, heaviest during Thu night. Warm (max 26°C on Wed afternoon, min 18°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Sun afternoon. Warm (max 22°C on Sun night, min 17°C on Fri morning). Winds increasing (calm on Fri night, fresh winds from the WSW by Sun night). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | SSE 7 | SSE 7 | SE 8 | SE 7 | SE 6 | SE 8 | SE 7 | SE 7 | SE 8 | SE 8 | ESE 8 | ESE 8 | E 4 | E 5 | E 6 | SE 12 | SSW 5 | SE 12 | S 7 | S 7 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 91 | 97 | 53 | 51 | 33 | 15 | 26 | 25 | 34 | 34 | 26 | 26 | 38 | 86 | 91 | 29 | 39 | 22 | 111 | 117 | 77 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | cross-on | cross-on | cross | cross-on | off | cross-off | cross-off | on | glassy | cross | cross-on | cross | cross | cross-off | cross | cross-off | cross | off |
High Tide | 12:54PM0.90m | 1:02AM0.69m | 1:51PM0.84m | 1:59AM0.63m | 2:56PM0.80m | 3:09AM0.60m | 4:02PM0.79m | 4:20AM0.60m | 5:03PM0.80m | 5:21AM0.64m | 5:53PM0.83m | 6:12AM0.69m | 6:36PM0.86m | ||||||||
Low Tide | 7:31PM0.20m | 6:30AM0.19m | 8:37PM0.25m | 7:19AM0.23m | 9:43PM0.27m | 8:42AM0.25m | 10:43PM0.26m | 10:14AM0.24m | 11:34PM0.23m | 11:15AM0.22m | 00:18AM0.20m | 12:06PM0.18m | 00:57AM0.14m | ||||||||
 | |  |  | |  | | |  | | | | | | |  |  | | | | | |
 | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 7:40 | — | — | 7:39 | — | — | 7:37 | — | — | 7:37 | — | — | 7:35 | — | — | 7:34 | — | — | 7:31 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 13 | 4 | — | — | — |
Temp °C | 22 | 23 | 24 | 25 | 26 | 26 | 25 | 25 | 19 | 20 | 21 | 21 | 20 | 21 | 20 | 20 | 19 | 22 | 20 | 23 | 24 |
Feels °C | 24 | 25 | 25 | 26 | 24 | 25 | 26 | 25 | 17 | 19 | 20 | 20 | 18 | 18 | 16 | 18 | 16 | 21 | 16 | 18 | 21 |
Swell 1 Height (m) Direction Period (s) | SSE 7 | SSE 7 | SE 8 | SE 7 | SE 6 | SSE 6 | SE 7 | SE 7 | SE 8 | SE 8 | ESE 8 | ESE 8 | SE 13 | SE 9 | SE 13 | E 5 | ESE 5 | SSW 5 | S 7 | SE 11 | SSW 7 |
| kJ | 91 | 97 | 53 | 51 | 33 | 13 | 26 | 25 | 34 | 34 | 26 | 26 | 7 | 3 | 6 | 29 | 8 | 20 | 111 | 19 | 77 |
Swell 2 Height (m) Direction Period (s) | S 13 | ENE 4 | S 7 | — | SE 9 | SE 8 | S 6 | SW 4 | SW 4 | SW 5 | S 6 | — | SE 9 | SE 13 | SE 9 | SSW 5 | SE 12 | ESE 7 | SE 12 | E 6 | SE 11 |
| kJ | 3 | 1 | 33 | — | 14 | 15 | 6 | 3 | 1 | 1 | 2 | — | 3 | 7 | 3 | 5 | 22 | 9 | 21 | 3 | 30 |
Swell 3 Height (m) Direction Period (s) | — | SE 12 | SSE 11 | NE 4 | SSW 6 | SSE 9 | SE 9 | S 6 | S 5 | SE 5 | SE 14 | SE 14 | S 7 | S 5 | S 5 | SE 12 | ESE 8 | SE 12 | E 6 | E 6 | E 6 |
| kJ | — | 6 | 12 | 1 | 3 | 8 | 3 | 2 | 2 | 1 | 8 | 7 | 1 | 1 | 1 | 23 | 7 | 22 | 3 | 3 | 1 |
Wind waves Height (m) Direction Period (s) | ENE 4 | — | — | S 6 | SSW 6 | SW 3 | SW 5 | — | — | NE 3 | NE 3 | E 3 | E 4 | E 5 | E 6 | — | SSW 5 | — | — | S 7 | — |
| kJ | 6 | — | — | 20 | 13 | 3 | 4 | — | — | 2 | 1 | 6 | 38 | 86 | 91 | — | 39 | — | — | 117 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 24 | 24 | 24 | 24 | 634 | 159 | 49 | 249 | 198 | 634 | 2715 | 152 | 642 | 702 | 642 | 906 | 25 | 198 | 26 | 29 | 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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