September in New Braunfels averages a daily high of 33.5°C with nights around 20.4°C. Expect roughly 6.6 wet days totalling 76.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit New Braunfels is October–April.
Based on NEW BRAUNFELS MUNICIPAL AIRPORT, TX US (9.3km), 1995–2024. 29 years of September data.