Fortress surfForecast / Long Island NY / USA

information circle12 Day Weather and Surf, issued 6 am Friday 12 Dec 2025 EST
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
9.4° C
(Which is normal for this time of year)


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 (Dec 18) at 4AM. The primary swell is predicted to be 1.2m and 6s period with a secondary swell of 0.3m and 10s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Fortress in the next 12 days are 1.3m 8s and forecast to arrive on Friday (Dec 19) at 1AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Dec 17) at 1PM.

Wave TypeTime (EST) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Thu 18th Dec)4ft (1.2m) 6s
Best Surf 4AM (Thu 18th Dec)4ft (1.2m) 6s
Most Powerful 1AM (Fri 19th Dec)4.5ft (1.3m) 8s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast A dusting of new snow. Icy conditions (max 6°C on Sat afternoon, min -6°C on Sun night). Winds increasing (moderate winds from the W on Fri night, strong winds from the NW by Sun night).

Days 3-6 Weather Summary Mostly dry. Icy conditions (max 7°C on Wed morning, min -5°C on Mon morning). Winds decreasing (strong winds from the NW on Mon morning, light winds from the W by Wed night).

Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Swell
Height Map
Wave Height (m) & direction (?)
0.1
SE
1.2
W
0.1
E
0.1
SE
0.1
SE
0.9
SSW
0.4
SSW
0.3
SSE
0.4
SSE
0.3
SE
0.3
SE
0.3
SE
0.6
SW
0.3
SE
0.3
SE
0.3
SE
1.4
SW
1.1
SW
1.3
SSW
1.3
SSW
1.3
SSW
Period(s) (?)85101096679101110711111066778
Wave
Graph
(?)Metric surfscale
Energy kJ (?)302436010103015181737191817152108150151196
Wind
(km/h)
40
WNW
40
W
30
W
30
SW
35
WSW
30
W
25
NNW
40
NW
45
NW
45
NW
35
NW
30
W
30
WNW
15
W
25
WSW
40
SW
40
WSW
30
WNW
10
SSW
20
SW
20
WSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffoffcross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
offoffcross-
off
offcross-
off
cross-
off
cross-
off
cross-
off
offcrosscross-
off
cross-
off
High Tide
/ height (m)
1:54PM
0.62
2:36AM
0.75
2:55PM
0.58
3:32AM
0.76
3:52PM
0.56
4:23AM
0.77
4:43PM
0.55
5:11AM
0.78
5:29PM
0.57
5:53AM
0.80
6:10PM
0.59
6:33AM
0.81
6:48PM
0.61
Low Tide
/ height (m)
7:52PM
0.11
8:53AM
0.14
8:40PM
0.12
9:48AM
0.13
9:22PM
0.12
10:36AM
0.11
10:02PM
0.11
11:17AM
0.09
10:41PM
0.09
11:54AM
0.06
11:20PM
0.08
12:30PM
0.03
11:59PM
0.06
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Sunrise7:03--7:03--7:03--7:05--7:05--7:05--7:07--
Sunset-4:19--4:19--4:19--4:20--4:20--4:20--4:21-
clear
clear
part cloud
part cloud
cloud
light snow
light snow
part cloud
clear
clear
cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
cloud
part cloud
Rain (mm)
---------------------
Temp. °C-111563-1-2-4-3-10-105776689
Feels °C (?)-12-10-9-4-3-4-10-13-16-14-9-11-7-6-4-3-3-2134
  • 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

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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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