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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Australia Data Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
A cold snap in Australia typically brings a sharp drop in temperatures, often driven by a strong cold front sweeping up from the Southern Ocean. For much of the south-east, this means days that feel more like mid-winter than early spring, with frosty mornings and brisk winds.
When and where do cold snaps usually hit?
Cold snaps are most common from late autumn through early spring, especially between May and October. The south-eastern states – Victoria, Tasmania, southern New South Wales and the ACT – feel them most acutely, though South Australia and south-west Western Australia can also be affected. A classic setup involves a high-pressure system drawing frigid air northward, often preceded by a rain band and gusty change.
How long does a typical cold snap last?
Most cold snaps run for two to four days before a milder air mass moves in. The initial frontal passage brings the sharpest temperature drop, followed by clear, cold nights that can produce widespread frost. In some years, a stubborn blocking high can prolong the chill for a week or more, especially across the inland south-east.
What’s the difference between a cold snap and a heatwave?
A cold snap is a sudden, brief period of unusually low temperatures, whereas a heatwave is a prolonged period of excessive heat. Cold snaps are driven by cold fronts and high pressure, while heatwaves are linked to slow-moving high‑pressure systems trapping hot air.
Can a cold snap cause snow in low‑lying areas?
Yes, especially in Tasmania and Victoria’s central highlands. During an intense cold snap, snow can fall to 200–400 metres in the south‑east, occasionally dusting the outskirts of Melbourne or the Blue Mountains. The Bureau of Meteorology issues special snow warnings when this is likely.
How should I prepare for a cold snap?
Check the severe weather warning page for frost and wind alerts. Protect plants, pipes and pets. Dress in layers, keep indoor heating safe, and allow extra travel time if frost or black ice is forecast on roads.
Sources
For current conditions around the country, visit our Australia weather hub or check forecasts for Melbourne, Sydney and Adelaide.