Strong southerly winds and a heavy ocean swell are set to define the opening stages of the 2025 Rolex Sydney Hobart Yacht Race. Crews are preparing for a demanding first night at sea.
Australia’s Bureau of Meteorology has warned of a sharp transition from harbour sailing to full ocean conditions soon after the start.
Speaking at the Compulsory Race Briefing in Sydney, BOM meteorologist Edward Townsend-Medlock said a slow-moving high-pressure system over Tasmania will shape the early race.
The system places the fleet on its eastern edge. This is expected to deliver firm southerlies and a long, mature swell running up the New South Wales coast.
Conditions inside Sydney Harbour are forecast to be brisk but manageable. Southerly winds of 15–20 knots are expected at the start.
The real test begins once yachts clear Sydney Heads. Winds are forecast to increase to 20–25 knots, with stronger gusts possible offshore.
The wind will align with a south to south-easterly swell of 2–3 metres. Sailors were reminded that individual waves can reach nearly twice the forecast height.
“That combination of strengthening winds and a mature swell from the south means it could get quite hairy quite quickly as boats exit the Heads,” Townsend-Medlock said.
Hazardous surf warnings are likely along the NSW coast on race day.
The swell period of 9–11 seconds points to a well-developed ocean swell generated far south. While predictable, it carries significant energy when combined with fresh winds.
The fleet will start on a high tide shortly after 1pm. This may reduce turbulence at the Heads but will not ease the incoming swell.
A small north-easterly swell of around half a metre may also enter the harbour, adding early lumpiness during manoeuvres.
Weather conditions are expected to remain mostly fine, with some cloud and only a slight chance of showers later in the day.
Strong south to south-westerly winds of 20–25 knots are forecast to persist along the coast into the evening. Crews face a physical and relentless opening leg.
The swell is expected to remain at 2–3 metres overnight, with wind waves building on top to create steep and awkward seas.
“There’s nothing extreme in terms of storm systems,” Townsend-Medlock said, “but it’s very much fresh to strong sailing early.”
Conditions are forecast to ease on Saturday morning. Winds are expected to drop to 10–20 knots as the high shifts east.
Wave heights should fall to 1–2 metres, improving comfort and boat handling.
Wind strength may vary later on Saturday. Lighter conditions are expected closer to the coast, with fresher breezes offshore.
The forecast highlights the importance of early decisions. A clean exit from Sydney Heads and conservative boat handling will be critical.
Strong southerly current eddies along the NSW south coast may also affect routing and sea state.
The message is clear. This year’s race will ask serious questions from the outset.
The harbour start may look spectacular, but beyond the Heads, crews face a true offshore test demanding preparation, discipline and respect for the conditions.
As Townsend-Medlock told competitors: enjoy the race — but be ready.
