September in Lafayette averages a daily high of 31.6°C with nights around 21.3°C. Expect roughly 9.4 wet days totalling 130mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Lafayette is February–April.
Based on LAFAYETTE REGIONAL AIRPORT, LA US (4.1km), 1995–2024. 30 years of September data.