August in Surprise averages a daily high of 41°C with nights around 27.2°C. Expect roughly 3.3 wet days totalling 25.3mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Surprise is November–March.
Based on YOUNGTOWN, AZ US (5km), 1995–2024. 28 years of August data.