Surf Forecasts:
Robert Moses State Park surf forecast from 30 Aug 2026:
- Best quality surf: Wednesday 2 Sep, 11PM (local time) - 4.5ft (1.4m), 7s period, ESE swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 5PM (local time) - 5.5ft (1.7m), 7s period, E swell with 258 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 11PM (local time) - 3ft (0.9m), 5s period with SSW swell.
Best Forecast Surf Conditions for Robert Moses State Park this week:
The surf forecast for Robert Moses State Park over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 30) at 11PM. The primary swell is predicted to be 0.9m and 5s period with a secondary swell of 0.8m and 5s. Another secondary swell of 0.4m and 8s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Robert Moses State Park in the next 16 days are 1.7m 7s and forecast to arrive on Wednesday (Sep 02) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Friday (Sep 04) at 11AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 30th Aug) | 3ft (0.9m) 5s |
| Best Surf | 11PM (Wed 2nd Sep) | 4.5ft (1.4m) 7s |
| Most Powerful | 5PM (Wed 2nd Sep) | 5.5ft (1.7m) 7s |
Table - best surf conditions forecast for Robert Moses State Park over the next 16 days.
The Lowdown
Alright, Rusty here, lookin' over the next couple weeks for Robert Moses State Park. I gotta be straight with you – it's a pretty bleak picture for paddle surfing. The entire 16-day window is a tough road, with almost no real quality on offer. We start with some tiny, weak dribble and it just never gets its act together. The first few days are a write-off, with poor surf and messy wind. There is a gap from the start all the way through Thursday morning, September 10th, with basically no surf worth paddling out for.
We finally see a slight pulse of energy on the afternoon of September 8th, with a combined energy of 202 (moderate) and chest-high 5ft swell from the SSE, but the wind is cross-onshore and the wave comment says "poor surf conditions" so don't get excited. A couple of days early in the second week, like September 7th, see a bump in period to 11 seconds, giving the 2ft to 2ft swell a touch more push, but it's still tiny and the energy is weak to moderate.
The best you're gonna see is Friday September 4th. We get a clean morning with clearing skies, a light 2ft swell from the ESE, and clean, cross-off wind from the NW. It's small, but for once the conditions are clean and rideable with a combined energy of 74 (weak). It's not gonna blow anyone's mind, but if you're desperate for a fun, small-wave session on a longboard, Friday morning is your window. After that, it's right back to small, weak, and often choppy conditions for the rest of the second week. The water temp is a touch warmer than normal, sitting around 73°, which is a bit above average for this time.
Honestly, for this stretch, the wind and swell are far more suited for a kite. The exposed beach setup here is gonna see a lot of chop and onshore junk. If you can kite, keep an eye on September 2nd afternoon – 6ft of E swell with cross-off NNE winds makes for a solid kite session, even if it's a mess on a surfboard.
Stay patient, boys.
Rusty
Short Range ForecastModerate rain (total 14mm), heaviest on Tue night. Warm (max 28°C on Tue afternoon, min 21°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 18mm), heaviest on Wed morning. Warm (max 28°C on Fri afternoon, min 20°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 8 | SE 8 | S 5 | SE 8 | SE 8 | SE 7 | SE 7 | S 5 | SE 12 | E 6 | E 7 | ESE 7 | ESE 8 | SE 7 | ESE 7 | ESE 7 | ESE 7 | S 6 | E 8 | E 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 24 | 18 | 23 | 17 | 23 | 19 | 8 | 11 | 92 | 160 | 258 | 114 | 158 | 136 | 51 | 52 | 37 | 21 | 21 | 20 | 20 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | off | cross-on | on | cross | cross-off | cross-on | cross-on | cross-on | cross-off | on | cross-on | cross-on | cross-off | cross-off | off | off | off | off | cross-off |
High Tide | 9:10AM1.42m | 9:26PM1.40m | 9:49AM1.44m | 10:09PM1.34m | 10:32AM1.45m | 10:58PM1.26m | 11:22AM1.44m | 11:55PM1.20m | 12:19PM1.43m | 00:57AM1.15m | 1:21PM1.41m | 2:03AM1.12m | 2:28PM1.41m | 3:13AM1.14m | |||||||
Low Tide | 3:28PM0.06m | 3:40AM-0.03m | 4:10PM0.08m | 4:15AM0.01m | 4:54PM0.12m | 4:54AM0.05m | 5:46PM0.17m | 5:41AM0.12m | 6:52PM0.23m | 6:43AM0.19m | 8:10PM0.23m | 8:03AM0.22m | 9:23PM0.19m | ||||||||
 | |  | | |  | |  |  |  | | |  |  |  | | | | | |  | |
 | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — |
 | — | 7:29 | — | — | 7:27 | — | — | 7:24 | — | — | 7:23 | — | — | 7:22 | — | — | 7:21 | — | — | 7:19 | — |
mm | — | — | 2 | — | — | — | — | — | 12 | 8 | — | 3 | 2 | 2 | 3 | — | — | — | — | — | — |
Temp °C | 23 | 25 | 27 | 23 | 24 | 23 | 25 | 28 | 24 | 22 | 24 | 22 | 22 | 24 | 25 | 24 | 28 | 25 | 21 | 24 | 23 |
Feels °C | 20 | 23 | 26 | 22 | 25 | 25 | 25 | 28 | 26 | 23 | 25 | 22 | 22 | 26 | 29 | 23 | 25 | 22 | 19 | 22 | 20 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | S 5 | S 4 | SSE 4 | SE 7 | SE 7 | SE 7 | SE 12 | SE 11 | SE 10 | ESE 7 | ESE 8 | SE 7 | ESE 7 | ESE 7 | ESE 7 | S 6 | SSW 6 | E 8 | E 8 |
| kJ | 24 | 18 | 23 | 6 | 8 | 19 | 7 | 7 | 92 | 96 | 64 | 114 | 158 | 136 | 51 | 52 | 37 | 21 | 13 | 20 | 20 |
Swell 2 Height (m) Direction Period (s) | S 6 | E 5 | SE 8 | SE 8 | SE 8 | SSE 4 | SSE 8 | SSE 8 | SSW 5 | S 5 | S 5 | SE 9 | S 5 | — | SE 8 | S 5 | SSW 5 | ESE 7 | E 8 | S 6 | SSW 7 |
| kJ | 2 | 1 | 17 | 17 | 23 | 3 | 7 | 7 | 7 | 2 | 2 | 73 | 2 | — | 34 | 11 | 9 | 15 | 21 | 6 | 15 |
Swell 3 Height (m) Direction Period (s) | E 6 | E 9 | — | — | — | — | SE 15 | SE 13 | — | — | — | S 5 | SSW 5 | — | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | ESE 8 | ESE 8 |
| kJ | 1 | 1 | — | — | — | — | 8 | 7 | — | — | — | 2 | 3 | — | 7 | 11 | 11 | 11 | 9 | 6 | 6 |
Wind waves Height (m) Direction Period (s) | SW 3 | SSW 4 | — | ESE 2 | E 3 | — | SSW 4 | S 5 | ENE 3 | E 6 | E 7 | — | — | S 5 | SSW 4 | NW 3 | WNW 3 | NW 3 | NNW 2 | — | — |
| kJ | 2 | 18 | — | 1 | 1 | — | 4 | 11 | 3 | 160 | 258 | — | — | 2 | 14 | 2 | 2 | 2 | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 545 | 2540 | 67 | 590 | 793 | 367 | 590 | 319 | 163 | 64 | 6 | 167 | 102 | 50 | 0 | 0 | 0 | 67 | 67 | 819 | 283 |
Best forecast wave conditions in Long Island New York | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Robert Moses State Park Surf forecast
The above surf forecast table for Robert Moses State Park provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Robert Moses State Park can be found by selecting the local surf guide option on the grey menu. Our Robert Moses State Park 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 (Robert Moses State Park) 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 Robert Moses State Park 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.
Robert Moses State Park is 10 km (6 miles) from West Islip. If you plan a vacation in Long Island New York, look for hotels and other accommodation in West Islip. West Islip has rooms for a wide range of budgets as well as car hire and transport links.
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