Gold Coast Marine Forecast
Updated Sat Aug 15, 2026
Building SE swell keeps seas rough all weekend into Monday
Marine Forecast for Aug 15–17, 2026
📋 Building SE swell keeps seas rough all weekend into Monday
Light 4-8kt SSE winds but building 4.6-5.6ft seas at 6-second periods make for choppy conditions - a NO-GO day. Wave forecast confidence is low, so conditions could end up worse than modeled.
Winds stay light (6-9kt SE/SSE) but seas build sharply from 5.4ft to over 7ft at short periods - unsafe, choppy conditions all day. Wave forecast confidence is low, so actual conditions may run rougher than shown.
Winds are light (6-11kt SE) but seas peak near 7.7ft at 7-second periods from the SE - the roughest day of the period and a clear NO-GO. Wave height forecasts show notable disagreement, so exercise extra caution.
Winds stay light and manageable (under 11 knots from the SSE/SE) across all three days, but that's not the limiting factor here - a persistent SE swell builds steadily from around 5 feet on Saturday to nearly 8 feet by Monday, all on a fairly short 6-7 second period that keeps the seas choppy and uncomfortable. With wave heights growing and confidence in the wave forecast actually diverging (especially Sunday and Monday), this is a NO-GO stretch for recreational boating.
Recent days at Gold Coast
About the Gold Coast
On the Gold Coast the day is usually decided before you clear the Broadwater. The Seaway bar is the gate: a SE groundswell meeting an ebbing tide at the entrance can turn a routine run-out into a standing wall of water, while the same swell on a rising tide might be a non-event. Get the bar wrong and the offshore forecast never matters.
This page updates daily with a live 3-day outlook for the Seaway and the grounds off it — SE swell height and period, wind, and how they line up against the tide. Each day is scored GO / CAUTION / NO-GO, the same AI rating used in the SeaLegs AI app.
Reading conditions off the Gold Coast
Watch swell against tide at the Seaway. The bar stacks up when a SE swell pushes against an ebb, so the safest window is often the run-out on the last of the flood or around high slack, with the return timed before the ebb builds. It isn't just height — a long-period SE groundswell throws far more energy at the entrance than a short, wind-driven sea of the same metre reading, and it's the period that catches people out.
Offshore, that same SE groundswell is what stands the near grounds up first. A fresh onshore behind it stacks a short chop on top of the longer swell out toward the 24, 36 and 50 fathom lines, so a workable morning can deteriorate fast once the sea breeze fills in. Read the bar and the tide together, pick your crossing windows both ways, and let the wind timing decide how far out — and how long — you stay.
Gold Coast forecast FAQ
When is the Gold Coast Seaway bar safe to cross?
The Seaway is at its worst when a SE swell runs against an ebbing tide — that's when the bar stacks into steep, breaking faces at the entrance. The safer window is generally a run-out on the last of the flood or near high slack, with your return planned before the ebb builds against the swell. Long-period SE groundswell matters more than raw height, so always weigh swell period and tide together, not just the metre reading.
How accurate is this Gold Coast marine forecast?
The outlook is generated from the latest marine model data and rated GO, CAUTION, or NO-GO by the same AI engine used in the SeaLegs AI app. It's a planning aid, not a substitute for the official Bureau of Meteorology (BoM) marine forecast and any current warnings — always check those before heading out.
How often is this forecast updated?
The page is rebuilt every morning from the latest model run, and the SpotCast card refreshes live in your browser. The date stamp above the outlook shows exactly when it was last generated.
What do GO, CAUTION, and NO-GO mean?
GO means conditions are favourable for most recreational boats. CAUTION means marginal — manageable for experienced crews in capable vessels, but check the wind and sea timing closely. NO-GO means conditions are hazardous for small craft and the trip is best postponed.
Can I get a forecast like this for my own spot?
Yes. In the free SeaLegs AI app you can drop a pin anywhere on Earth — your local ramp, a favourite mark, or a spot well offshore — and get the same AI-rated marine forecast and trip planning.
More offshore forecasts
Get this forecast for your own spot
Drop a pin on any spot on planet Earth in the free SeaLegs AI app — AI marine forecasts, fishing reports, and trip planning, rated GO / CAUTION / NO-GO.
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