July in Perth averages a daily high of 18.5°C with nights around 8.1°C. Expect roughly 16.2 wet days totalling 147.1mm. 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 July data.