September in Spring averages a daily high of 32.5°C with nights around 21.5°C. Expect roughly 8.3 wet days totalling 127mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Spring is February–April.
Based on HOUSTON INTERCONTINENTAL AIRPORT, TX US (11.9km), 1995–2024. 30 years of September data.