July in Mission averages a daily high of 36.2°C with nights around 25.1°C. Expect roughly 3.2 wet days totalling 54.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Mission is November–March.
Based on MCALLEN, TX US (7.9km), 1995–2024. 26 years of July data.