August in Mesa averages a daily high of 40.2°C with nights around 25°C. Expect roughly 4.4 wet days totalling 31.7mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Mesa is November–March.
Based on TEMPE ASU, AZ US (9.2km), 1995–2024. 27 years of August data.