Surf Forecasts:
Cupsogue surf forecast from 14 Aug 2026:
- Best quality surf: Monday 17 Aug, 11AM (local time) - 5ft (1.6m), 7s period, SSE swell with offshore winds.
- Most powerful swell: Monday 17 Aug, 8AM (local time) - 5.5ft (1.7m), 7s period, SSE swell with 268 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 11AM (local time) - 5ft (1.6m), 7s period with SSE swell.
Best Forecast Surf Conditions for Cupsogue this week:
The surf forecast for Cupsogue over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 11AM. The primary swell is predicted to be 1.6m and 7s period with a secondary swell of 1.0m and 6s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Cupsogue in the next 16 days are 1.7m 7s and forecast to arrive on Monday (Aug 17) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Monday (Aug 17) at 5PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 17th Aug) | 5ft (1.6m) 7s |
| Best Surf | 11AM (Mon 17th Aug) | 5ft (1.6m) 7s |
| Most Powerful | 8AM (Mon 17th Aug) | 5.5ft (1.7m) 7s |
Table - best surf conditions forecast for Cupsogue over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get straight into it for Cupsogue.
Right off the bat, things are looking grim. We’ve got a stretch of poor surf that runs from now through the weekend. Friday the 14th and Saturday the 15th are basically a write-off – tiny, messy, with onshore or cross-shore wind. Sunday the 16th isn’t any better. You’re looking at a long, flat, and choppy gap until things finally start to change.
The first real glimmer of hope comes on Monday the 17th. The morning sees a moderate offshore wind from the NW, cleaning things up nicely. The swell picks up to 5ft from the SSE, with a period of 7 seconds. The combined energy hits 287 (moderate energy), so there’s some push. The water is sitting at 77°, which is a solid 4° warmer than normal for this time of year – that’s a notable difference, so you’ll be comfortable in a shorty or springsuit. It’s a fairly consistent spot, but with the NW wind and that size, it’s going to be clean and fun for intermediate surfers. The swell direction is SSE, and the optimum for this spot is SW, so it’s not a perfect match, but the offshore wind makes up for a lot. Keep in mind the period is short at 7 seconds, so waves will be a bit crumbly, not the long lines you’d get from a groundswell. This Monday morning window is the standout – the best on offer.
The rest of that week is a mixed bag. Monday afternoon and Tuesday the 18th still have some small, clean waves, but they’re ordinary. Wednesday the 19th and Thursday the 20th are poor again, with onshore wind and chop. Friday the 21st through Sunday the 23rd is another stretch of poor conditions – onshore, cross-shore, and small.
The second week is quieter. Monday the 24th and Tuesday the 25th have a little bit of bump, but nothing to write home about. Wednesday the 26th and Thursday the 27th are poor. Friday the 28th has a bit of clean swell in the morning (2ft from the SE, period 10 seconds, combined energy 107 – moderate), but the wind is light and cross-offshore, so it’s surfable but ordinary. That’s about the only flicker of hope in the second week. The last few days, Saturday the 29th, show a little more clean swell, but it’s still small.
Honestly, if you’re not out there on Monday the 17th morning, you’re going to be waiting a long time for anything decent. The rest of the window is mostly flat or messy. The break is a beach/jetty setup, so when the swell is that small and the wind is onshore, it’s not going to hold much shape. For the kite surfers, the stronger onshore winds later in the week might offer some interest, but for a paddle surfer, the pickings are slim.
Rusty.
Short Range ForecastHeavy rain (total 21mm), heaviest during Sun night. Warm (max 25°C on Fri morning, min 20°C on Fri night). Winds increasing (calm on Sun morning, fresh winds from the S by Sun night). | Days 4-6 Weather SummaryModerate rain (total 14mm), heaviest on Mon morning. Warm (max 27°C on Wed night, min 20°C on Tue morning). Winds increasing (calm on Tue afternoon, fresh winds from the SSW by Wed night). | ||||||||||||||||||||
Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 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) | S 5 | SE 9 | S 5 | SSE 9 | S 6 | SSE 6 | S 6 | S 4 | SSE 6 | SSE 7 | SE 6 | SE 6 | SE 7 | SSE 7 | SSE 7 | SE 7 | S 4 | S 6 | S 6 | S 6 | S 6 |
Wave Graph | |||||||||||||||||||||
2 | 13 | 3 | 8 | 3 | 4 | 3 | 17 | 131 | 209 | 94 | 39 | 51 | 53 | 38 | 24 | 21 | 85 | 106 | 80 | 22 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | cross | cross-on | off | cross-on | cross-on | cross-on | off | cross-off | cross | cross-off | cross-on | cross | cross-on | cross-on | cross | cross-off | cross-off | cross-off |
High Tide | 9:20AM1.12m | 9:40PM1.18m | 10:07AM1.12m | 10:26PM1.12m | 10:53AM1.11m | 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 | |||||||
Low Tide | 3:03PM0.00m | 3:31AM-0.02m | 3:47PM0.03m | 4:08AM0.02m | 4:30PM0.08m | 4:45AM0.06m | 5:14PM0.15m | 5:24AM0.12m | 6:01PM0.21m | 6:06AM0.17m | 6:52PM0.27m | 6:53AM0.22m | 7:48PM0.31m | ||||||||
5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | |
— | 7:50 | — | — | 7:49 | — | — | 7:47 | — | — | 7:45 | — | — | 7:45 | — | — | 7:43 | — | — | 7:42 | — | |
mm | — | — | 1 | — | — | — | — | — | 20 | 8 | — | — | — | — | — | — | — | 6 | 3 | — | — |
Temp °C | 25 | 25 | 25 | 22 | 24 | 24 | 23 | 24 | 24 | 24 | 25 | 25 | 23 | 25 | 24 | 25 | 25 | 27 | 25 | 30 | 28 |
Feels °C | 25 | 24 | 24 | 20 | 23 | 23 | 22 | 21 | 20 | 24 | 26 | 27 | 24 | 26 | 24 | 25 | 24 | 25 | 28 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | SE 9 | S 5 | ENE 3 | E 3 | SSE 6 | S 6 | SSE 8 | — | SSE 7 | SE 6 | SE 6 | SE 7 | SSE 7 | SSE 7 | SE 7 | SE 7 | SE 9 | S 6 | S 6 | S 6 |
8 | 13 | 2 | 2 | 1 | 4 | 2 | 7 | — | 209 | 94 | 39 | 51 | 53 | 38 | 24 | 17 | 13 | 106 | 54 | 22 | |
Swell 2 Height (m) Direction Period (s) | S 5 | SE 13 | SE 9 | SSE 9 | SE 9 | SE 9 | SE 9 | S 6 | — | SSW 6 | SSW 6 | SSW 6 | SSW 6 | E 4 | SE 11 | SE 10 | SE 10 | — | ESE 9 | SE 9 | SE 8 |
2 | 7 | 3 | 8 | 3 | 3 | 3 | 1 | — | 78 | 30 | 12 | 7 | 2 | 19 | 16 | 14 | — | 8 | 3 | 17 | |
Swell 3 Height (m) Direction Period (s) | — | E 7 | SE 6 | S 5 | S 6 | S 5 | SE 6 | — | — | — | — | ENE 5 | E 5 | SE 12 | — | — | — | — | — | — | — |
— | 1 | 1 | 2 | 2 | 1 | 1 | — | — | — | — | 7 | 4 | 6 | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | S 5 | — | — | ENE 3 | — | — | S 4 | SSE 6 | — | NNE 3 | NE 5 | — | — | SSW 6 | S 6 | S 4 | S 6 | — | S 6 | — |
— | 2 | — | — | 2 | — | — | 17 | 131 | — | 7 | 17 | — | — | 23 | 18 | 21 | 85 | — | 80 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 870 | 3402 | 870 | 1619 | 1751 | 1619 | 1453 | 1180 | 301 | 0 | 0 | 17 | 0 | 314 | 122 | 282 | 287 | 130 | 0 | 0 | 17 |
Best forecast wave conditions in Long Island New York | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Cupsogue Surf forecast
The above surf forecast table for Cupsogue provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cupsogue can be found by selecting the local surf guide option on the grey menu. Our Cupsogue 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 (Cupsogue) 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 Cupsogue 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.
Cupsogue is 12 km (7 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.











