May in Dallas averages a daily high of 29.4°C with nights around 19.1°C. Expect roughly 9.4 wet days totalling 120.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Dallas is March–April.
Based on DALLAS FAA AIRPORT, TX US (6.7km), 1995–2024. 30 years of May data.