September in Waco averages a daily high of 32.7°C with nights around 20°C. Expect roughly 5.4 wet days totalling 76.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Waco is March–April.
Based on WACO DAM, TX US (8.7km), 1995–2024. 21 years of September data.