Surf Forecasts:
Road K surf forecast from 17 Aug 2026:
- Best quality surf: Monday 17 Aug, 8PM (local time) - 4ft (1.2m), 7s period, S swell with offshore winds.
- Most powerful swell: Monday 17 Aug, 2PM (local time) - 5.5ft (1.7m), 7s period, S swell with 255 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 8PM (local time) - 4ft (1.2m), 7s period with S swell.
Best Forecast Surf Conditions for Road K this week:
The surf forecast for Road K over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 8PM. The primary swell is predicted to be 1.2m and 7s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Road K in the next 16 days are 1.7m 7s and forecast to arrive on Monday (Aug 17) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Tuesday (Aug 18) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 17th Aug) | 4ft (1.2m) 7s |
| Best Surf | 8PM (Mon 17th Aug) | 4ft (1.2m) 7s |
| Most Powerful | 2PM (Mon 17th Aug) | 5.5ft (1.7m) 7s |
Table - best surf conditions forecast for Road K over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s be straight with you—it’s a quiet stretch ahead for Road K. Most of the next two weeks is a write-off, with only a couple of brief windows that might get you excited. We’re starting right now, and the first real surf worth paddling out for doesn’t show until the morning of the 18th, so you’ve got a few days to sit tight.
That first pickup on Tuesday the 18th is small but clean. You’re looking at 3ft of SSE swell at 7 seconds, with a light offshore N wind keeping things tidy. The energy is weak—95 is the number—but for a beginner-friendly sandbar, it’s about as good as it gets. The water is about average for this time of year, nothing weird going on there.
After that, the 19th stays small but glassy in the morning. 2ft of SE swell, 7 seconds, and dead flat conditions with a W wind. It’s tiny, but if you’re just after a splash, it’s clean. Then we hit a proper dry spell. From the 20th through the 24th, it’s almost completely flat—mostly 1ft of short-period junk. There’s a few mornings of offshore or cross-off winds that make it look pretty, but there’s nothing underneath. Don’t bother.
The only other flicker of hope is the morning of the 24th, with 1ft of SE swell at 12 seconds. That long period means it’s got a bit more push in theory, but with that size, it’s still a knee-slapper. Moderate offshore NNW wind though, so if you’re desperate, it’s clean.
Now, the one real standout—mark the calendar for the 29th of August. That’s a Saturday, and it’s a proper change. Morning kicks off with 4ft of SSE groundswell at 12 seconds, cross-off NNE wind, and the energy meter jumps to 747. That’s moderate to strong, and it’s solid. The afternoon gets even better: 6ft of SE swell at 11 seconds, light offshore NW wind, clean as a whistle, and energy at 861. This is the best we get. It’s not huge, but it’s got enough push and the wind is right. Crowds are likely here, so get in early. That long period is more at home on a point or reef, but Road K is a sandbar, so it might get a bit straight—still, it’s a far cry from the junk we’ve been dealing with.
After that, it fades back to small and messy—the 30th and 31st are small cross-on or choppy, and the 1st of September is back to 3ft of windswell. The 29th is your day. Don’t sleep on it.
Rusty
Short Range ForecastHeavy rain (total 24mm), heaviest during Mon morning. Warm (max 26°C on Wed afternoon, min 21°C on Sun night). Winds decreasing (fresh winds from the SSE on Mon morning, calm by Tue afternoon). | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Fri night. Warm (max 26°C on Wed night, min 20°C on Sat morning). Wind will be generally light. | ||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||
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) | S 5 | S 6 | S 6 | S 6 | SSE 7 | SSE 7 | SE 8 | SE 7 | SE 7 | SE 9 | SE 9 | SE 8 | SE 9 | SE 9 | SE 8 | E 5 | SE 8 | SE 8 | SE 7 |
Wave Graph | |||||||||||||||||||
34 | 199 | 163 | 86 | 84 | 69 | 38 | 27 | 34 | 39 | 19 | 17 | 12 | 19 | 18 | 22 | 16 | 15 | 16 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-off | off | off | cross-on | cross | glassy | cross-on | cross-on | cross | on | cross | cross | cross-on | cross | cross-off | cross-off | glassy |
High Tide | 11:12PM1.04m | 11:39AM1.07m | 11:58PM0.96m | 12:27PM1.02m | 00:46AM0.87m | 1:17PM0.98m | 1:39AM0.80m | 2:13PM0.94m | 2:38AM0.76m | 3:12PM0.92m | 3:41AM0.74m | 4:11PM0.94m | 4:40AM0.76m | ||||||
Low Tide | 4:45AM0.06m | 5:14PM0.15m | 5:24AM0.12m | 6:01PM0.21m | 6:06AM0.17m | 6:52PM0.27m | 6:53AM0.22m | 7:48PM0.31m | 7:44AM0.26m | 8:52PM0.33m | 8:39AM0.28m | 10:06PM0.32m | |||||||
— | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | |
7:46 | — | 7:45 | — | — | 7:44 | — | — | 7:43 | — | — | 7:40 | — | — | 7:39 | — | — | 7:37 | — | |
mm | 5 | 18 | 1 | — | — | — | — | — | — | — | 1 | 1 | 3 | — | — | 5 | 1 | — | — |
Temp °C | 23 | 23 | 24 | 22 | 23 | 25 | 25 | 24 | 26 | 26 | 21 | 22 | 23 | 21 | 22 | 22 | 21 | 20 | 21 |
Feels °C | 19 | 22 | 27 | 22 | 24 | 26 | 26 | 26 | 26 | 26 | 19 | 24 | 27 | 21 | 22 | 21 | 22 | 19 | 24 |
Swell 1 Height (m) Direction Period (s) | — | — | S 6 | S 6 | SSE 7 | SSE 7 | S 7 | SE 7 | SE 7 | SE 9 | SW 5 | SSW 5 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | E 5 |
— | — | 163 | 86 | 84 | 69 | 32 | 27 | 34 | 39 | 5 | 9 | 12 | 19 | 18 | 17 | 16 | 15 | 14 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | E 4 | E 4 | SE 8 | S 6 | SSW 6 | S 4 | SE 9 | SE 8 | SSW 5 | S 5 | S 5 | S 5 | SE 13 | SE 13 | SE 7 |
— | — | — | — | 4 | 3 | 38 | 20 | 12 | 8 | 19 | 17 | 5 | 2 | 2 | 2 | 7 | 7 | 14 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SE 13 | SE 12 | SSE 11 | SE 10 | SSE 10 | SSE 6 | SSE 6 | ESE 6 | ESE 7 | E 8 | E 7 | SE 14 | — | SE 9 | ESE 13 |
— | — | — | — | 7 | 6 | 12 | 15 | 9 | 4 | 10 | 3 | 4 | 4 | 1 | 8 | — | 3 | 16 | |
Wind waves Height (m) Direction Period (s) | S 5 | S 6 | — | NNE 3 | NE 4 | — | — | — | — | — | — | — | — | ENE 3 | E 4 | E 5 | E 4 | E 4 | — |
34 | 199 | — | 1 | 4 | — | — | — | — | — | — | — | — | 4 | 12 | 22 | 9 | 10 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1640 | 32 | 2 | 0 | 0 | 84 | 17 | 0 | 214 | 140 | 851 | 1759 | 271 | 636 | 851 | 136 | 191 | 892 | 0 |
Best forecast wave conditions in Long Island New York | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Road K Surf forecast
The above surf forecast table for Road K provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Road K can be found by selecting the local surf guide option on the grey menu. Our Road K 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 (Road K) 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 Road K 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.
Road K is 28 km (17 miles) from Mastic. If you plan a vacation in Long Island New York, look for hotels and other accommodation in Mastic. Mastic has rooms for a wide range of budgets as well as car hire and transport links.











