August in Perth averages a daily high of 19.1°C with nights around 8.5°C. Expect roughly 14.7 wet days totalling 120.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Perth is October–December.
Based on PERTH METRO, AS (3.8km), 1995–2024. 30 years of August data.