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Surf Forecasts:

Cupsogue surfForecast / Long Island NY / USA

information circle12 Day Weather and Surf, issued 1 am Monday 15 Sep 2025 EDT
Forecast update in hr  min  s Forecast update imminent
Cupsogue surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Cupsogue sea temperature is
21.3° C
 (Which is 1.1°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Cupsogue this week:

The surf forecast for Cupsogue over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 18) at 11AM. The primary swell is predicted to be 0.8m and 7s period with a secondary swell of 0.3m and 9s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Cupsogue in the next 12 days are 1.2m 8s and forecast to arrive on Tuesday (Sep 16) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 8s period and expected on Tuesday (Sep 16) at 8PM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)11AM (Thu 18th Sep)2.5ft (0.8m) 7s
Best Surf11AM (Thu 18th Sep)2.5ft (0.8m) 7s
Most Powerful 8AM (Tue 16th Sep)4ft (1.2m) 8s

Table - best surf conditions forecast for Cupsogue over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Light rain (total 4mm), mostly falling on Wed afternoon. Warm (max 20°C on Mon morning, min 18°C on Mon night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Warm (max 27°C on Fri afternoon, min 12°C on Sat morning). Winds increasing (light winds from the NNE on Thu morning, fresh winds from the NNE by Fri night).

Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.1
S
0.5
E
0.1
SE
1.3
ESE
1.4
SE
1.2
SE
1.2
SE
1.1
SE
1
SE
0.8
SE
0.6
SE
0.6
SE
0.3
SE
0.3
SW
0.8
ENE
0.1
SE
0.8
E
0.2
SSE
0.4
SE
0.5
SE
0.6
SE
Period(s) (?)134128887777689549616151413
Wave
Graph
(?)Metric surfscale
Energy kJ (?)496001781601369654334813422343267589134
Wind
(km/h)
20
E
20
ESE
20
E
25
ENE
20
E
20
E
20
E
15
E
10
NE
5
NNE
15
SSW
20
WSW
15
NW
5
N
30
NNE
20
NE
15
ESE
15
SE
15
SE
15
SSE
10
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		crosscross-
off		cross-
on		cross-
off		offcross-
off		cross-
off		crossononononcross
High Tide
/ height (m)
2:52PM
1.05
3:30AM
0.84
4:00PM
1.04
4:36AM
0.87
5:01PM
1.06
5:33AM
0.93
5:55PM
1.08
6:22AM
0.99
6:41PM
1.09
7:05AM
1.04
7:25PM
1.09
7:46AM
1.08
8:05PM
1.08
Low Tide
/ height (m)
9:02PM
0.23
8:49AM
0.23
10:34PM
0.21
10:13AM
0.23
11:42PM
0.18
11:32AM
0.20
12:29AM
0.15
12:28PM
0.16
1:05AM
0.12
1:10PM
0.12
1:32AM
0.10
1:44PM
0.10
1:56AM
0.09
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Sunrise6:30--6:31--6:31--6:33--6:33--6:35--6:35--
Sunset-7:00--6:58--6:57--6:54--6:52--6:52--6:50-
clear
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
light rain
light rain
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
-------13------------
Temp. °C202019191918191919202122242724131515161616
Feels °C (?)18181716151517171821222122252081111131314
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Long Island NY

  1. weather stationWind Update Continuing clean conditions at Cupsogue (light winds from the NNE at Westhampton Beach/Francis S. Gabreski Airport 11 km from Cupsogue). No surfable waves

    1 hour 38 minutes ago Cupsogue
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1 h 38 min ago

6 km/h
NNE
Clean
Please reload the page to see if there are any updates.

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Cupsogue surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Cupsogue at:
surf-forecast.com

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 12 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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