August in Phoenix averages a daily high of 40.8°C with nights around 28.8°C. Expect roughly 4.6 wet days totalling 24.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Phoenix is November–March.
Based on PHOENIX AIRPORT, AZ US (6.9km), 1995–2024. 30 years of August data.