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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Southern Focus Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above before you head out, as Postans can swing from mild mornings to hot afternoons with a sea breeze arriving late. Located on Perth’s southern coastal fringe, the suburb experiences a classic Mediterranean climate with dry summers and cool, wet winters.
What is the typical weather pattern in Postans?
Postans sits about 30 kilometres south of Perth’s CBD, close to the coast, which moderates extreme heat. Summers are hot and dry, with January averages around 30–33°C, while winters are cool and damp, with July highs near 17°C. The sea breeze from Cockburn Sound and the Indian Ocean often arrives by early afternoon, dropping temperatures and bringing moisture inland. Rainfall is heavily concentrated between May and September, with June the wettest month.
When do severe weather events happen here?
Severe storms are rare but can occur in late spring or early summer when a trough meets humid air from the north-west. Thunderstorms may bring sudden heavy downpours and gusty winds. Heatwaves are more common: several days above 38°C can strain power grids and health. The Bureau of Meteorology issues warnings for extreme heat and severe storms, so check the live forecast above and our Severe Weather Warning page during risky months.
Does Postans get much wind?
Yes, especially in summer. The afternoon sea breeze, known locally as the “Fremantle Doctor”, can gust above 30 km/h from the south-west, cooling the suburb quickly but making outdoor activities feel brisk.
Is Postans prone to flooding?
Flash flooding can occur after intense summer storms or prolonged winter rain. Low-lying areas near the coast and drainage channels are most at risk. Always follow BOM warnings.
What UV level should I expect in Postans?
UV Index peaks in summer at extreme (11–12+). Protection is essential between 9am and 4pm. Even in winter, midday UV can reach moderate levels, so sunscreen is recommended year-round.
Sources
For broader outlooks, visit our Australia weather hub or the Perth Weather page.