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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Southern Pulse Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Western Australia should brace for a sharp, dry chill as a polar air mass sweeps north across the state, dropping temperatures well below the July average for several days. The live forecast above shows the immediate outlook for your location, but the broader pattern brings frosty mornings and brisk south-westerly winds from the coast inland.
How long will this polar air mass affect WA?
The cold pool is expected to linger over the state for at least three to four days, driven by a strong high-pressure system in the Bight that is funnelling Antarctic air across the South West Land Division. Perth and the Wheatbelt will see overnight lows dip into single digits, while southern coastal towns such as Albany and Esperance can expect maximums struggling to reach 14°C. The air mass will slowly moderate by the weekend as the high shifts east, but residents should plan for a prolonged, unseasonably cold spell.
Will there be any rain or snow with this system?
Rainfall will be light and patchy, mostly confined to the south coast and the lower South West. The air mass is notably dry, so widespread precipitation is unlikely. However, the Stirling Range and higher peaks of the Great Southern may see a dusting of snow above 800 metres, particularly on Wednesday morning. For the rest of the state, expect clear skies and bitter nights.
Why is this polar air mass so cold for WA?
It originated over the Antarctic ice shelf and travelled rapidly across the Southern Ocean without being warmed by land or sea. The lack of cloud cover also allows maximum heat loss at night, intensifying the chill.
Is this a typical winter event for Western Australia?
Polar outbreaks occur every few winters, but this one is notable for its duration and the depth of the cold air. July averages in Perth sit around 18°C; daytime highs here may only reach 12–14°C for several days.
Should I prepare for frost damage to plants?
Yes, especially in the Avon Valley, Great Southern and Central Wheatbelt. Cover sensitive vegetation overnight and bring potted plants indoors. Frost warnings are likely from the Bureau of Meteorology.
For the latest on this system, check our Australia weather hub or the Severe Weather Warning page. Residents in the south can also follow South Australia Weather for updates as the air mass drifts east.