August in McAllen averages a daily high of 36.9°C with nights around 25.4°C. Expect roughly 3.4 wet days totalling 40.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit McAllen is November–March.
Based on MCALLEN, TX US (2.4km), 1995–2024. 25 years of August data.