August in Deer Valley averages a daily high of 39.2°C with nights around 27°C. Expect roughly 4.6 wet days totalling 23.8mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Deer Valley is January–April.
Based on PHOENIX DEER VALLEY MUNICIPAL AIRPORT, AZ US (6.4km), 1995–2024. 25 years of August data.