Surf Forecasts:
Fortress surf forecast from 6 Sep 2026:
- Best quality surf: Friday 11 Sep, 5AM (local time) - 3.5ft (1.0m), 7s period, S swell with offshore winds.
- Most powerful swell: Thursday 10 Sep, 2AM (local time) - 6.5ft (2.0m), 7s period, SSW swell with 356 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 5AM (local time) - 3.5ft (1.0m), 7s period with S 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 Friday (Sep 11) at 5AM. The primary swell is predicted to be 1.0m and 7s period with a secondary swell of 0.2m and 10s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Fortress in the next 16 days are 2.0m 7s and forecast to arrive on Thursday (Sep 10) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 09) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Fri 11th Sep) | 3.5ft (1.0m) 7s |
| Best Surf | 5AM (Fri 11th Sep) | 3.5ft (1.0m) 7s |
| Most Powerful | 2AM (Thu 10th Sep) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Fortress over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's on the table for the next couple of weeks.
Well, I gotta be straight with you, it's looking pretty grim out there. The swell is tiny and the wind is all over the shop for the first week and a half. We're starting off with a real flat spell. From the 5th right through until the 10th, it's all small, weak, and messy. The water is sitting at a pretty average 69°F for this time of year, so no surprises there.
The first real sign of life doesn't show up until Thursday the 10th. We get a pulse of 5ft swell from the SSW, but the period is a short, crumbly 7 seconds. The energy is moderate at best (257), and while the wind is offshore on the 10th, the whole setup is still labelled as poor surf conditions. It's just not coming together. The next day, the 11th, early morning sees a clean offshore wind from the NW with a tiny 3ft S swell, but it's still weak and the rating is only a 1. It's surfable, but barely worth the paddle.
Then we hit a real blank patch. From the 12th through to the 16th, it's back to tiny, weak, and mostly onshore slop. Nothing to get excited about.
Now, here's the kicker. On the 17th and 18th, the swell really jumps. We're looking at 8ft from the ENE on the 17th, with a strong energy reading (792 to 823). That's a solid, powerful swell. But the wind is a brutal cross-onshore at 22 mph, making it a lumpy, choppy mess. For a spot like Fortress (a reef break), a big swell from the SE quarter is not ideal, and with that wind, it's not going to be a fun paddle. The 18th is similar, a bit smaller at 7ft, but still blown out. This is the kind of setup that looks more interesting for kite surfing than paddle surfing, to be honest.
The 19th sees the swell drop back to 4ft, and the wind improves in the afternoon to a light cross-offshore, but it's still only a moderate energy (151).
In short, the entire 16-day window is a write-off for quality surf at Fortress. There are no standouts. The waves are either too small, too messy, or too blown out. The only real "energy" comes with a big, messy wind that ruins any chance of a clean wave. It's one of those stretches where the forecast can change, but for now, it's a solid blank.
- Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Warm (max 25°C on Mon night, min 16°C on Sun morning). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Thu night. Warm (max 25°C on Thu night, min 19°C on Fri morning). Winds increasing (light winds from the ESE on Tue afternoon, strong winds from the SW by Wed night). | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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 8 | E 5 | ENE 4 | E 7 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | SE 9 | SE 10 | ESE 10 | SSW 7 | SSW 7 | SSW 7 | S 7 | S 7 | S 7 | S 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 9 | 42 | 21 | 31 | 30 | 18 | 17 | 17 | 7 | 6 | 3 | 4 | 9 | 356 | 249 | 222 | 124 | 56 | 54 | 33 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross |
High Tide | 3:10PM0.89m | 3:53AM0.69m | 4:36PM0.91m | 5:11AM0.75m | 5:44PM0.94m | 6:12AM0.83m | 6:39PM0.98m | 7:03AM0.91m | 7:27PM0.99m | 7:50AM0.98m | 8:11PM0.98m | 8:33AM1.02m | 8:51PM0.95m | |||||||
Low Tide | 10:06PM0.15m | 9:29AM0.13m | 11:08PM0.10m | 10:47AM0.09m | 11:59PM0.04m | 11:51AM0.04m | 00:44AM-0.01m | 12:46PM-0.02m | 1:24AM-0.04m | 1:34PM-0.05m | 2:00AM-0.05m | 2:19PM-0.05m | 2:34AM-0.05m | |||||||
 |  |  | |  |  | |  | | | | |  | | | |  | | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — |
 | 7:14 | — | — | 7:12 | — | — | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:06 | — | — | 7:04 | — |
mm | — | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — |
Temp °C | 22 | 20 | 17 | 18 | 19 | 20 | 24 | 25 | 20 | 22 | 22 | 22 | 22 | 23 | 23 | 24 | 25 | 20 | 23 | 21 |
Feels °C | 22 | 16 | 13 | 18 | 17 | 16 | 20 | 20 | 18 | 21 | 19 | 19 | 20 | 18 | 18 | 22 | 24 | 17 | 19 | 15 |
Swell 1 Height (m) Direction Period (s) | E 7 | S 6 | ESE 7 | E 7 | E 10 | E 10 | E 10 | E 10 | SSW 5 | SE 9 | SE 9 | SE 10 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | S 7 | S 7 | S 7 | S 7 |
| kJ | 8 | 3 | 10 | 31 | 30 | 18 | 17 | 17 | 2 | 3 | 3 | 4 | 9 | 8 | 8 | 9 | 124 | 56 | 54 | 33 |
Swell 2 Height (m) Direction Period (s) | SSW 5 | SE 9 | S 6 | S 6 | SE 9 | SE 9 | SE 8 | SE 8 | E 9 | E 9 | E 9 | SE 8 | E 9 | E 9 | — | — | ESE 10 | ESE 10 | SE 10 | SE 9 |
| kJ | 3 | 3 | 2 | 2 | 3 | 3 | 3 | 3 | 7 | 6 | 1 | 3 | 2 | 2 | — | — | 9 | 9 | 15 | 3 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SW 5 | SE 9 | SE 9 | S 6 | S 5 | S 5 | SSW 3 | SE 9 | — | S 5 | E 8 | — | — | — | — | — | — | — | SE 11 |
| kJ | 9 | 1 | 3 | 3 | 2 | 1 | 1 | 1 | 3 | — | 1 | 1 | — | — | — | — | — | — | — | 5 |
Wind waves Height (m) Direction Period (s) | — | E 5 | ENE 4 | — | NNW 2 | NNW 3 | — | — | NW 2 | SSW 5 | SW 3 | SSW 3 | SSW 5 | SSW 7 | SSW 7 | SSW 7 | — | NE 3 | ENE 4 | ENE 4 |
| kJ | — | 42 | 21 | — | 1 | 1 | — | — | 1 | 2 | 3 | 8 | 92 | 356 | 249 | 222 | — | 2 | 6 | 6 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2546 | 160 | 129 | 51 | 51 | 15 | 15 | 15 | 414 | 3314 | 578 | 636 | 1065 | 1463 | 365 | 38 | 55 | 0 | 2 | 52 |
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.
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