September in League City averages a daily high of 31.3°C with nights around 21.9°C. Expect roughly 10.4 wet days totalling 191.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit League City is February–May.
Based on HOUSTON NATIONAL WEATHER SERVICE OFFICE, TX US (4.1km), 1995–2024. 29 years of September data.