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Surf Forecasts:

Fortress surfForecast / Long Island NY / USA

information circle12 Day Weather and Surf, issued 7 pm Wednesday 17 Sep 2025 EDT
Forecast update in hr  min  s Forecast update imminent
Fortress surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Fortress sea temperature is
20.4° C
 (Which is slightly warmer than usual)

Best Forecast Surf Conditions for Fortress this week:

The surf forecast for Fortress over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 18) at 2PM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.2m and 5s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Fortress in the next 12 days are 1.1m 11s and forecast to arrive on Monday (Sep 22) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 2s period and expected on Friday (Sep 19) at 2AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+) 2PM (Thu 18th Sep)3ft (0.9m) 7s
Best Surf 8PM (Mon 22nd Sep)3.5ft (1.0m) 11s
Most Powerful 8AM (Mon 22nd Sep)3.5ft (1.1m) 11s

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

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

Short Range Forecast Mostly dry. Warm (max 25°C on Fri afternoon, min 16°C on Fri night). Winds increasing (calm on Thu afternoon, fresh winds from the NE by Fri night).

Days 3-6 Weather Summary Mostly dry. Warm (max 20°C on Tue afternoon, min 14°C on Mon morning). Winds decreasing (fresh winds from the E on Sun morning, calm by Mon afternoon).

Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wed
24
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.3
ESE
0.9
ESE
0.8
ESE
0.7
ESE
0.6
ESE
0.4
ESE
0.9
NE
1.1
ENE
0.8
E
0.9
ESE
0.4
SE
0.6
SE
0.6
SE
0.7
SE
0.7
SE
1
SE
1.1
SE
1
SE
0.9
SE
0.9
SE
0.9
SE
Period(s) (?)777877455513121211111089998
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1608870513620216637306193108114110177160145110112105
Wind
(km/h)
20
NE
15
NNE
10
SW
20
W
15
NW
15
WSW
30
NE
30
ENE
25
ESE
20
E
30
E
25
E
15
ESE
10
E
5
S
20
SSW
15
SW
30
SW
25
SW
20
W
20
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		crosscross-
off		cross-
off		offcross-
off		crosscross-
on		ononcross-
on		ononcross-
on		crosscrosscross-
off		cross-
off		cross-
off		offcross-
off
High Tide
/ height (m)
6:07AM
0.80
6:35PM
0.91
6:55AM
0.86
7:18PM
0.91
7:37AM
0.91
7:57PM
0.90
8:15AM
0.94
8:30PM
0.87
8:50AM
0.96
8:59PM
0.84
9:21AM
0.95
9:24PM
0.81
9:51AM
0.93
Low Tide
/ height (m)
11:55PM
0.09
11:50AM
0.11
12:36AM
0.06
12:38PM
0.07
1:11AM
0.05
1:19PM
0.05
1:41AM
0.03
1:56PM
0.03
2:08AM
0.03
2:31PM
0.04
2:34AM
0.03
3:04PM
0.05
3:01AM
0.05
3:38PM
0.08
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wed
24
Sunrise-6:30--6:31--6:31--6:33--6:33--6:35--6:35-
Sunset--6:52--6:50--6:49--6:46--6:45--6:44--6:42
cloud
cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
Rain (mm)
---------------------
Temp. °C191820212225241617161615151516171920212327
Feels °C (?)1617212021232391211109101416151818202225
  • 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 The wind is still cross-on at Fortress (light winds from the ENE at Montauk Airport 6 km from Fortress). 1.2m 7s swell from the ESE with a 0.3m 6s windswell from the S. 2 swells combining to make bigger set waves.

    2 hours 12 minutes ago Fortress
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2 h 12 min ago

19 km/h
ENE
Cross-On
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 Fortress 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 Fortress at:
surf-forecast.com

Information about the Fortress Surf forecast

The above surf forecast table for Fortress provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Fortress can be found by selecting the local surf guide option on the grey menu. Our Fortress 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 (Fortress) 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 Fortress 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.

Fortress is 39 km (24 miles) from New London. If you plan a vacation in Long Island New York, look for hotels and other accommodation in New London. New London has rooms for a wide range of budgets as well as car hire and transport links.

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