Surf Forecasts:
Fortress surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 5AM (local time) - 2.5ft (0.8m), 7s period, SSE swell with cross-offshore winds.
- Most powerful swell: Tuesday 18 Aug, 5PM (local time) - 2.5ft (0.8m), 7s period, SSE swell with 70 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 5AM (local time) - 2.5ft (0.8m), 7s 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 Wednesday (Aug 19) at 5AM. The primary swell is predicted to be 0.8m and 7s period with a secondary swell of 0.2m and 11s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Fortress in the next 16 days are 0.8m 7s and forecast to arrive on Tuesday (Aug 18) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Monday (Aug 24) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 19th Aug) | 2.5ft (0.8m) 7s |
| Best Surf | 5AM (Wed 19th Aug) | 2.5ft (0.8m) 7s |
| Most Powerful | 5PM (Tue 18th Aug) | 2.5ft (0.8m) 7s |
Table - best surf conditions forecast for Fortress over the next 16 days.
The Lowdown
Second Text in Imperial Units:
Alright mate, Rusty here. Let’s break down Fortress over the next couple weeks.
First thing: it’s a dry spell for a long time. From now until late August, there’s basically nothing worth paddling for. The combined swell energy is weak (under 100) and the waves are tiny and messy. It’s a proper gap.
Water temp is about 73°F, which is 1°F above normal – so average for the time of year.
The first real chance comes late on Thursday, August 27th. You get a 5ft swell from the S, period of 7 seconds, and it’s clean with a moderate cross-off wind. Combined energy hits 336, but the forecast says it’s still just marginal.
Your best bet is Friday morning, August 28th. A clean 4ft swell from the S at 8 seconds, with light offshore N winds at 9 mph, and combined energy of 222. It’s clean, it’s the pick of the lot. That afternoon gets bigger – 5ft from the S, period up to 9 seconds, combined energy of 699 – but the wind turns cross-shore, making it marginal.
After that, it drops off again into small, ordinary surf through the end of August and into early September. A few pulses show up but with messy winds and poor direction. For a fairly consistent reef, this is a quiet run. The standout session is Friday morning the 28th of August. Don’t waste your time the rest of the fortnight.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue night. Warm (max 26°C on Wed afternoon, min 20°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sat afternoon. Warm (max 24°C on Fri afternoon, min 19°C on Sat morning). Winds decreasing (fresh winds from the ENE on Sat afternoon, light winds from the SSE by Sun afternoon). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
AM | 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) | SSE 7 | SSE 7 | SE 8 | SE 7 | SSE 6 | SE 8 | ESE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | E 4 | E 5 | E 5 | E 4 | SSE 6 | SSE 6 | S 7 | S 6 | S 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 69 | 70 | 38 | 33 | 24 | 15 | 21 | 13 | 12 | 18 | 17 | 17 | 38 | 49 | 27 | 22 | 14 | 33 | 56 | 51 | 41 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross-off | cross | cross-off | cross-off | glassy | cross-off | cross | on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-off | off | cross-off | cross-off |
High Tide | 12:35PM0.87m | 00:23AM0.67m | 1:23PM0.81m | 1:03AM0.61m | 2:23PM0.77m | 1:53AM0.57m | 3:43PM0.74m | 3:07AM0.55m | 4:56PM0.75m | 5:09AM0.57m | 5:52PM0.77m | 6:10AM0.62m | 6:36PM0.80m | ||||||||
Low Tide | 6:28PM0.20m | 6:07AM0.15m | 7:27PM0.26m | 6:51AM0.20m | 8:51PM0.30m | 7:45AM0.24m | 10:13PM0.29m | 8:54AM0.27m | 11:11PM0.26m | 10:13AM0.26m | 11:56PM0.22m | 11:19AM0.23m | 00:32AM0.16m | ||||||||
 | |  |  | |  |  |  | | | |  | |  | | | | | | | | |
 | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — |
 | — | 7:42 | — | — | 7:40 | — | — | 7:38 | — | — | 7:37 | — | — | 7:36 | — | — | 7:35 | — | — | 7:32 | — |
mm | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | 4 | — | 1 | 2 | 2 | — | — | — |
Temp °C | 21 | 23 | 25 | 25 | 26 | 25 | 24 | 23 | 23 | 21 | 24 | 23 | 20 | 20 | 19 | 20 | 22 | 24 | 21 | 25 | 25 |
Feels °C | 23 | 24 | 26 | 26 | 26 | 24 | 23 | 25 | 25 | 19 | 23 | 23 | 18 | 16 | 16 | 20 | 24 | 25 | 18 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | SSE 7 | SSE 7 | SE 8 | SE 7 | SSE 6 | SE 8 | ESE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 13 | ESE 8 | ESE 8 | SSE 8 | SSE 6 | SSE 6 | S 7 | SE 11 | S 6 |
| kJ | 69 | 70 | 38 | 33 | 24 | 15 | 21 | 13 | 12 | 18 | 17 | 17 | 7 | 6 | 6 | 7 | 10 | 33 | 56 | 20 | 41 |
Swell 2 Height (m) Direction Period (s) | E 4 | SE 12 | S 7 | S 6 | SE 9 | SSE 6 | S 5 | ESE 9 | ESE 8 | S 5 | S 5 | S 5 | — | SE 9 | SE 9 | ESE 12 | ESE 12 | ENE 3 | SE 12 | ESE 7 | SE 11 |
| kJ | 3 | 6 | 22 | 12 | 14 | 10 | 9 | 8 | 7 | 4 | 4 | 2 | — | 3 | 3 | 15 | 14 | 1 | 21 | 5 | 18 |
Swell 3 Height (m) Direction Period (s) | SE 13 | SE 12 | SSE 11 | SSE 10 | — | SE 9 | SE 9 | S 5 | S 5 | SE 15 | SE 14 | SE 14 | — | SE 13 | SE 13 | — | ESE 7 | ESE 12 | — | — | ESE 7 |
| kJ | 7 | 6 | 12 | 10 | — | 3 | 3 | 2 | 2 | 8 | 8 | 8 | — | 7 | 7 | — | 5 | 14 | — | — | 5 |
Wind waves Height (m) Direction Period (s) | ENE 4 | — | SSW 2 | SSW 6 | — | SSW 3 | SSW 5 | — | — | NE 3 | E 4 | E 4 | E 4 | E 5 | E 5 | E 4 | E 4 | — | — | S 6 | — |
| kJ | 3 | — | 1 | 12 | — | 2 | 3 | — | — | 6 | 14 | 15 | 38 | 49 | 27 | 22 | 10 | — | — | 51 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 9 | 9 | 0 | 222 | 187 | 155 | 222 | 193 | 668 | 51 | 231 | 394 | 636 | 25 | 193 | 167 | 55 | 47 | 185 | 0 |
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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