Surf Forecasts:
Cupsogue surf forecast from 3 Sep 2026:
- Best quality surf: Thursday 3 Sep, 11PM (local time) - 1.5ft (0.4m), 8s period, SE swell with cross-offshore winds.
- Most powerful swell: Thursday 10 Sep, 5AM (local time) - 6ft (1.8m), 7s period, SSW swell with 299 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 11PM (local time) - 1.5ft (0.4m), 8s period with SE 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 Thursday (Sep 03) at 11PM. The primary swell is predicted to be 0.4m and 8s period with a secondary swell of 0.6m and 5s. Another secondary swell of 0.8m and 4s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cupsogue in the next 16 days are 1.8m 7s and forecast to arrive on Thursday (Sep 10) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Sunday (Sep 06) at 2PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 3rd Sep) | 1.5ft (0.4m) 8s |
| Best Surf | 11PM (Thu 3rd Sep) | 1.5ft (0.4m) 8s |
| Most Powerful | 5AM (Thu 10th Sep) | 6ft (1.8m) 7s |
Table - best surf conditions forecast for Cupsogue over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at the surf outlook for Cupsogue.
Honestly, it’s looking like a tough stretch ahead for Cupsogue. We’ve got a real dry spell on our hands, with almost nothing in the way of decent waves for the next week. The first real glimmer of something interesting doesn’t show up until Thursday the 10th of September. For nearly a full week before that, from now right through the 9th, you’re looking at tiny, weak swell. We're talking knee-high or less, with combined swell energy barely registering (6 to 29, mostly). It’s a total write-off for paddling out.
Then on Thursday the 10th, the morning brings a pulse of energy. The southeast swell jumps up to 6 ft from the SSW with a short 7-second period. The combined energy hits 607 (moderate wave energy), which is the only real punch in the whole forecast. The wind is cross-offshore from the WSW at 25 mph, so it’ll be clean. But that 6 ft is pushing into the intermediate zone, and at a beach/jetty setup with a short period, it’ll be a bit raw and lumpy. It’s only rated marginal by the models, so don’t expect magic.
If you’re desperate for a paddle, that Thursday morning (Sep 10) is your best shot, but it’s not a standout by any means. The rest of the window is full of poor surf conditions, tiny swell, and onshore or cross-shore winds. The water is a touch warmer than normal at 72°, but that won’t help the wave quality.
Given the combination of significant swell with short period, moderate energy, and a beach/jetty break, this setup honestly looks more interesting for kite surfing than traditional paddle surfing.
Keep an eye on it, but don't get your hopes up.
- Rusty
Short Range ForecastModerate rain (total 10mm), heaviest on Thu night. Warm (max 28°C on Fri afternoon, min 17°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Tue afternoon, min 17°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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 6 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SSW 6 | SE 8 | E 6 | SSW 6 | S 6 | S 6 | SE 9 | SSW 6 | SW 4 | SW 4 | SW 5 | SW 5 | SSW 5 | SE 10 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 39 | 27 | 35 | 23 | 23 | 10 | 6 | 10 | 15 | 8 | 3 | 2 | 3 | 4 | 3 | 5 | 5 | 58 | 15 | 15 | 141 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | off | cross | off | cross-off | cross-off | cross | cross-off | on | off | cross-off | cross | cross-off | cross-off | cross-off | cross-on | on | cross-on | cross-off |
High Tide | 12:52PM1.08m | 1:19AM0.86m | 1:55PM1.06m | 2:28AM0.83m | 3:04PM1.06m | 3:39AM0.85m | 4:11PM1.08m | 4:45AM0.90m | 5:12PM1.12m | 5:44AM0.98m | 6:07PM1.15m | 6:35AM1.05m | 6:58PM1.18m | ||||||||
Low Tide | 6:36PM0.15m | 6:43AM0.11m | 7:40PM0.19m | 7:46AM0.15m | 8:52PM0.20m | 8:55AM0.17m | 10:10PM0.18m | 10:09AM0.16m | 11:24PM0.13m | 11:22AM0.12m | 00:22AM0.08m | 12:27PM0.07m | 1:08AM0.04m | ||||||||
 | |  |  |  |  | | | | | |  | | |  | | | | |  | | |
 | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — |
 | — | 7:20 | — | — | 7:17 | — | — | 7:16 | — | — | 7:15 | — | — | 7:14 | — | — | 7:12 | — | — | 7:09 | — |
mm | 1 | 1 | 5 | — | — | 1 | — | — | 2 | — | — | — | — | — | — | — | — | — | — | 3 | 1 |
Temp °C | 23 | 25 | 24 | 26 | 28 | 28 | 22 | 24 | 21 | 18 | 21 | 20 | 20 | 23 | 23 | 23 | 26 | 24 | 21 | 20 | 22 |
Feels °C | 23 | 26 | 26 | 29 | 30 | 27 | 18 | 23 | 20 | 13 | 19 | 17 | 16 | 21 | 20 | 21 | 23 | 21 | 20 | 20 | 22 |
Swell 1 Height (m) Direction Period (s) | SE 6 | ESE 6 | S 5 | SSW 5 | SE 8 | SSW 5 | ESE 7 | SSW 6 | SSW 7 | E 6 | E 7 | E 7 | ESE 11 | ESE 11 | ESE 10 | SW 4 | SW 5 | SSW 5 | SSW 5 | S 5 | SE 9 |
| kJ | 39 | 20 | 16 | 7 | 23 | 9 | 21 | 6 | 15 | 58 | 42 | 21 | 40 | 38 | 35 | 5 | 5 | 15 | 15 | 14 | 13 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 8 | SE 8 | E 6 | ESE 7 | SSW 6 | E 6 | ESE 7 | SSW 6 | S 6 | ESE 9 | E 5 | SE 9 | SE 8 | ESE 10 | E 9 | SE 9 | SSE 10 | SE 10 | E 9 |
| kJ | 39 | 27 | 35 | 23 | 7 | 9 | 6 | 7 | 10 | 8 | 3 | 29 | 2 | 3 | 3 | 18 | 6 | 3 | 9 | 15 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | E 6 | SSW 4 | SE 8 | E 6 | SE 8 | — | — | SE 9 | S 6 | SE 9 | S 6 | S 6 | SE 9 | SE 9 | E 9 | E 8 | E 3 | — |
| kJ | — | — | — | 7 | 4 | 10 | 7 | 10 | — | — | 3 | 2 | 3 | 1 | 1 | 3 | 3 | 6 | 1 | 1 | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | SW 5 | — | SW 4 | — | — | — | E 6 | NNE 3 | — | SW 2 | — | SSW 6 | SW 4 | SW 4 | — | SW 5 | — | — | SSW 7 |
| kJ | 8 | 13 | 22 | — | 7 | — | — | — | 15 | 4 | — | 1 | — | 4 | 3 | 15 | — | 58 | — | — | 141 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 116 | 116 | 0 | 17 | 277 | 261 | 327 | 156 | 253 | 1630 | 114 | 17 | 17 | 20 | 134 | 214 | 868 | 54 | 581 | 3372 | 100 |
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.
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