May in Reynosa averages a daily high of 33.8°C with nights around 22.9°C. Expect roughly 4.3 wet days totalling 53.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Reynosa is November–March.
Based on MCALLEN MILLER INTERNATIONAL AIRPORT, TX US (11.7km), 1995–2024. 30 years of May data.