Sydney Marine Forecast
Updated Tue Jul 28, 2026
Tuesday GO, Wednesday NO-GO, Thursday CAUTION
Forecast for Jul 28–30, 2026
📋 Tuesday GO, Wednesday NO-GO, Thursday CAUTION
Tuesday is the GO day with light 5-10 knot northwest winds and comfortable 1.8-2.4 feet SSE swell at 7-8 second periods. Best window is 8:00 AM to 5:00 PM AEST. Forecast confidence is very high at 95%.
Wednesday is NO-GO due to steep wind-wave chop building from the southwest that crosses a surging southerly swell by evening, with seas reaching 6.2 feet by 9:00 PM AEST. A brief morning window exists before 4:00 PM AEST, but return well before then. Wave timing has lower model confidence — plan conservatively.
Thursday is CAUTION all day with 5.3-6.2 feet southerly swell at 7-8 second periods persisting throughout. Winds are light at 4-8 knots SW to WSW, but the wave height alone makes conditions challenging for recreational vessels. There is no clear safe window — avoid if possible.
Tuesday offers the only clean GO day of the three-day window, with light northwest winds and well-organized SSE swell. Wednesday deteriorates sharply in the evening as steep wind-wave chop builds from the southwest, making conditions unsafe for recreational vessels. Thursday carries elevated swell throughout the entire day, keeping conditions at CAUTION level despite light winds.
Recent days at Sydney
About Sydney
Sydney's coastal water is exposed, and the thing that most often decides a day here is not the morning conditions but how fast they change. The outlook below is built around that: wind, swell and sea state across the next few days, so you can see whether a window holds.
It updates every morning from the latest marine model data, and each day gets an honest GO, CAUTION, or NO-GO call — the same AI rating used in the SeaLegs AI app.
Reading Sydney's coastal waters
From roughly October to February, the pattern to respect is the southerly buster — an abrupt southerly change that runs up the NSW coast, typically arriving late afternoon or early evening after a hot day. The stronger ones bring peak gusts of 40 knots or more, with wind swinging from light and northwesterly to a hard southerly within minutes and the temperature dropping sharply at the same time. Gusts usually ease within 30 to 60 minutes of arrival, but that is more than long enough to turn a pleasant afternoon into a serious one if you're offshore and heading south.
Worth knowing: a true buster is a specific event, not just any southerly change. Ordinary southerly changes are common and far milder. Either way the practical lesson is the same — on a hot day with a light northerly, treat the afternoon as borrowed time and plan to be back in before the change. Read the whole window below, not just the hour you'd leave.
Sydney forecast FAQ
What is a southerly buster?
It's an abrupt, strong southerly change that charges up the New South Wales coast, mostly between October and February, usually reaching Sydney in the late afternoon or early evening after a hot day. Strong ones gust over 40 knots and drop the temperature sharply within minutes. It's a specific pattern — stronger and more sudden than an ordinary southerly change — and the gusty phase typically eases within 30 to 60 minutes.
How accurate is this Sydney 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 Bureau of Meteorology's coastal waters forecast and marine warnings — always check those, especially when a change is forecast.
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 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.
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Get this forecast for your own spot
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