Robert Moses State Park Surf Forecast

/ Long Island NY (34 breaks) / New York (44 breaks) /

USA (1297 breaks) / Lat Long: (40.62° N 73.26° W)

Surf Forecasts:

Robert Moses State Park surfForecast / Long Island NY / USA

12 Day Weather and Surf, issued 1 pm Wednesday 20 Aug 2025 EDT

Forecast update in hr min s Forecast update imminent

Robert Moses State Park surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.

Today's Robert Moses State Park sea temperature is 24.3° C
(Which is 2.0°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Robert Moses State Park this week:

The surf forecast for Robert Moses State Park over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 21) at 5PM. The primary swell is predicted to be 3.0m and 18s period with a secondary swell of 2.3m and 8s. 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 12 days are 3.5m 18s and forecast to arrive on Thursday (Aug 21) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 3s period and expected on Wednesday (Aug 27) at 2AM.

Wave Type	Time (EDT) & Date	Wave Height & Period
Next good surf (1 star+)	5PM (Thu 21st Aug)	10ft (3.0m) 18s
Best Surf	5PM (Thu 21st Aug)	10ft (3.0m) 18s
Most Powerful	8PM (Thu 21st Aug)	11ft (3.5m) 18s

Table - best surf conditions forecast for Robert Moses State Park over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Light rain (total 9mm), mostly falling on Wed afternoon. Warm (max 25°C on Fri afternoon, min 17°C on Thu night). Winds decreasing (strong winds from the NE on Thu afternoon, light winds from the ENE by Fri afternoon).											Days 3-6 Weather Summary Moderate rain (total 11mm), heaviest on Mon night. Warm (max 24°C on Sat afternoon, min 21°C on Tue morning). Winds decreasing (fresh winds from the SSW on Sat night, light winds from the SSE by Mon morning).
	Wed 20		Thursday 21			Friday 22			Saturday 23			Sunday 24			Monday 25			Tuesday 26
	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM
Rating (10 max)	1	0	1	!	!	4	1	1	0	0	0	0	0	0	0	0	0	0	0	0	2
Swell Height Map See all maps
Wave Height (m) & direction (?)	SSE	SSE	SSE	SSE	SSE	ESE	ESE	ESE	ESE	E	ESE	E	E	E	ESE	SE	SE	SSE	SSE	SSE	SSE
Period(s) (?)	15	16	16	18	16	13	12	11	11	11	11	11	11	11	10	6	6	13	12	13	13
Wave Graph (?)
Energy (?)	1063	1828	2414	6658	6518	3661	1982	647	390	334	227	168	134	122	53	63	66	190	191	426	574
Wind (km/h)	E	ENE	NE	NE	NNE	NNE	SSW	SW	SW	S	SSW	S	S	S	SSW	S	SW	W	WSW	WNW	WNW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross	cross	cross- off	cross- off	cross- off	cross- off	cross- on	cross	cross	cross- on	cross- on	on	on	cross- on	cross- on	on	cross- on	cross- off	cross	cross- off	cross- off
High Tide / height (m)	5:51PM 1.49		6:26AM 1.27	6:43PM 1.53		7:15AM 1.34	7:29PM 1.54		8:00AM 1.38		8:11PM 1.52	8:43AM 1.40		8:52PM 1.47	9:25AM 1.40		9:32PM 1.40	10:06AM 1.38		10:13PM 1.31	10:47AM 1.34
Low Tide / height (m)		12:20AM 0.01	12:18PM 0.06		1:09AM -0.03	1:10PM 0.04		1:54AM -0.06	1:58PM 0.03		2:34AM -0.06		2:42PM 0.04	3:12AM -0.04		3:24PM 0.07	3:47AM 0.01		4:04PM 0.12	4:20AM 0.08

	Wed 20		Thursday 21			Friday 22			Saturday 23			Sunday 24			Monday 25			Tuesday 26
Sunrise	-	-	6:07	-	-	6:09	-	-	6:09	-	-	6:11	-	-	6:11	-	-	6:13	-	-	6:13
Sunset	7:44	-	-	7:42	-	-	7:40	-	-	7:38	-	-	7:37	-	-	7:36	-	-	7:35	-	-

Rain (mm)	3	6	-	-	-	-	-	-	-	-	-	-	-	-	-	-	11	-	-	-	-
Temp. °C	20	19	18	22	21	22	25	22	23	24	22	23	24	23	23	24	24	22	24	23	20
Feels °C (?)	17	15	13	16	15	17	23	19	21	21	18	22	22	22	25	25	22	17	19	18	16

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Long Island NY

Wind Update Still cross-shore at Robert Moses State Park (light winds from the E.(Wind varies from 006 to 011 degs) at Farmingdale Airport 18 km from Robert Moses State Park). 1.5m 15s groundswell from the SSE with a 1.2m 5s windswell from the ESE. 2 swells combining to make bigger set waves.
1 hour 48 minutes ago Robert Moses State Park

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18 km away, 1 h 48 min ago

19 km/h

0.0

24.3

Air / Water (°C)

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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 12 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.