May in Houston averages a daily high of 30.3°C with nights around 20.9°C. Expect roughly 7.6 wet days totalling 137.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Houston is February–April.
Based on HOUSTON WILLIAM P HOBBY AIRPORT, TX US (15.2km), 1995–2024. 30 years of May data.