May in Perth averages a daily high of 22.4°C with nights around 10.5°C. Expect roughly 10.1 wet days totalling 84.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Perth is October–December.
Based on PERTH METRO, AS (3.8km), 1995–2024. 30 years of May data.