
Surf Forecasts:
Fortress surf forecast from 13 Sep 2026:
- Best quality surf: Sunday 13 Sep, 8PM (local time) - 2.5ft (0.8m), 6s period, SSE swell with offshore winds.
- Most powerful swell: Sunday 20 Sep, 8PM (local time) - 5ft (1.5m), 6s period, ENE swell with 154 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 8PM (local time) - 2.5ft (0.8m), 6s period with SSE swell.
Best Forecast Surf Conditions for Fortress this week:
The surf forecast for Fortress over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 13) at 8PM. The primary swell is predicted to be 0.8m and 6s period with a secondary swell of 0.4m and 9s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Fortress in the next 16 days are 1.5m 6s and forecast to arrive on Sunday (Sep 20) 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 1.4m 5s period and expected on Sunday (Sep 20) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sun 13th Sep) | 2.5ft (0.8m) 6s |
| Best Surf | 8PM (Sun 13th Sep) | 2.5ft (0.8m) 6s |
| Most Powerful | 8PM (Sun 20th Sep) | 5ft (1.5m) 6s |
Table - best surf conditions forecast for Fortress over the next 16 days.
The Lowdown
Alright, let’s get into it.
First up, this stretch we’re looking at is pretty grim, to be honest. There’s almost nothing on the cards that’s gonna get the heart racing. The only window that even remotely stands out is around the 25th, and even that’s ordinary at best. We’ve got a lot of small, weak surf with messy winds, and a whole lot of “poor surf conditions” stamped across the forecast.
The first few days – starting this Sunday the 13th – are just tiny. We’re talking 1ft of short-period SE swell at Fortress, with a light cross-offshore breeze. It’s clean, but it’s gutless. The kind of day where you’re just scratching for ankle-biters. Combined energy is only 76, which is weak. Water temp is 69°, which is about normal for this time of year.
Monday and Tuesday are even worse, with the swell dropping and winds getting messy – cross-on and choppy. Nothing to even bother suiting up for. We’re in a real flat spell here, and it’s gonna stretch on for days.
The swell starts to pick up a little from the 21st, but the wind is all over the place. We see some moderate energy (131, then 220 on the 21st afternoon), but that bigger pulse is accompanied by cross-on winds and lumpy conditions. Bad timing. The 22nd is a write-off, with strong winds and messy seas. And by the 23rd we’ve got 5ft to 5ft of short-period ENE swell, but it’s gonna be a washing machine – fresh cross-shore winds and a lumpy chop. No good for a paddle board, that’s for sure.
Now, here’s where it gets interesting for the experts. The 24th has some size – 4ft – and clean conditions with a cross-offshore breeze, but the quality is still poor. Weak energy from a short period. The real bright spot, if you can call it that, is the 25th. Friday morning sees offshore winds, 3ft of ESE swell, and clean conditions. It’s not big, but it’s the best we’ve got. Combined energy is 137, moderate. This is the standout, but it’s still ordinary. A beginner might enjoy it, but anyone with experience will be left wanting more.
After that, it fades back out quickly. The 26th has some clean offshore wind in the morning but the swell is dropping. And then it’s back to tiny and weak for the rest of the period.
So, bottom line: this is one of those long, flat stretches that can test your patience. The only day worth even a look is the 25th, and even then, keep your expectations low. We’re not seeing any proper groundswell – everything is short-period and weak. The long-range stuff is a long way off and not worth pinning your hopes on. It’s been grim, and it’s gonna stay grim for a while.
Rusty
Short Range ForecastHeavy rain (total 34mm), heaviest during Sun afternoon. Warm (max 23°C on Sun night, min 15°C on Tue morning). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Thu night. Warm (max 21°C on Thu morning, min 18°C on Wed afternoon). Wind will be generally light. | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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 9 | SSE 6 | SE 9 | SE 9 | SE 8 | ENE 5 | E 5 | ESE 5 | ESE 9 | ESE 5 | E 7 | ESE 12 | ESE 7 | ESE 7 | ESE 12 | ESE 12 | ESE 12 | SE 12 | SE 8 | SSW 5 |
Wave Graph | ||||||||||||||||||||
31 | 43 | 27 | 26 | 18 | 24 | 11 | 8 | 8 | 5 | 7 | 15 | 10 | 9 | 14 | 14 | 13 | 21 | 18 | 57 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | on | glassy | cross-off | cross | cross |
High Tide | 10:02PM0.85m | 10:31AM0.98m | 10:34PM0.79m | 11:08AM0.92m | 11:06PM0.73m | 11:46AM0.85m | 11:40PM0.67m | 12:26PM0.79m | 00:22AM0.62m | 1:16PM0.74m | 1:14AM0.59m | 2:31PM0.70m | 2:28AM0.57m | |||||||
Low Tide | 3:41PM0.01m | 3:38AM0.01m | 4:20PM0.06m | 4:11AM0.06m | 4:59PM0.13m | 4:46AM0.11m | 5:42PM0.20m | 5:24AM0.17m | 6:31PM0.27m | 6:08AM0.23m | 7:37PM0.31m | 7:03AM0.27m | 9:21PM0.31m | |||||||
— | — | 6:26 | — | — | 6:26 | — | — | 6:28 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | |
7:00 | — | — | 6:59 | — | — | 6:57 | — | — | 6:55 | — | — | 6:53 | — | — | 6:52 | — | — | 6:50 | — | |
mm | 34 | — | — | — | — | — | — | — | — | — | — | — | — | 6 | — | — | — | — | — | 3 |
Temp °C | 22 | 23 | 20 | 23 | 20 | 16 | 17 | 17 | 17 | 18 | 20 | 21 | 21 | 21 | 18 | 20 | 20 | 19 | 20 | 21 |
Feels °C | 22 | 23 | 13 | 17 | 13 | 13 | 16 | 15 | 16 | 16 | 18 | 20 | 19 | 22 | 16 | 20 | 20 | 20 | 19 | 19 |
Swell 1 Height (m) Direction Period (s) | SE 5 | SSE 6 | SSW 6 | SE 9 | SE 8 | SE 9 | E 5 | ESE 5 | ESE 5 | ESE 5 | ESE 6 | ESE 8 | ESE 7 | ESE 7 | ESE 6 | ESE 7 | ESE 7 | SE 8 | SE 8 | SE 11 |
21 | 43 | 11 | 26 | 18 | 13 | 11 | 7 | 5 | 5 | 3 | 11 | 10 | 9 | 8 | 9 | 9 | 18 | 18 | 30 | |
Swell 2 Height (m) Direction Period (s) | SSW 6 | SE 9 | SE 9 | S 6 | S 6 | S 6 | ESE 9 | ESE 9 | ESE 9 | E 7 | E 7 | ESE 12 | SE 12 | SE 12 | ESE 12 | ESE 12 | E 4 | ESE 12 | ESE 11 | — |
24 | 21 | 27 | 6 | 6 | 3 | 8 | 8 | 8 | 4 | 4 | 15 | 6 | 6 | 14 | 14 | 1 | 13 | 13 | — | |
Swell 3 Height (m) Direction Period (s) | SE 9 | — | SE 6 | SSE 6 | E 15 | SSE 7 | S 7 | S 6 | SE 13 | SE 9 | SE 13 | SE 9 | SE 9 | SSW 4 | SE 9 | SE 9 | ESE 12 | SE 12 | — | — |
31 | — | 9 | 3 | 4 | 4 | 4 | 3 | 7 | 3 | 7 | 3 | 3 | 1 | 3 | 3 | 13 | 21 | — | — | |
Wind waves Height (m) Direction Period (s) | — | SSW 6 | NNW 4 | NNW 3 | NE 4 | ENE 5 | — | — | — | SSW 2 | SW 3 | SW 4 | SW 4 | — | ENE 3 | E 4 | — | — | SSW 3 | SSW 5 |
— | 24 | 14 | 3 | 15 | 24 | — | — | — | 1 | 5 | 4 | 3 | — | 6 | 9 | — | — | 4 | 57 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 9 | 668 | 15 | 239 | 808 | 801 | 803 | 801 | 1155 | 676 | 383 | 231 | 191 | 676 | 801 | 676 | 0 | 1163 | 222 |
Best forecast wave conditions in Long Island New York | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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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 16 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.










