September in Dallas averages a daily high of 32.3°C with nights around 21.5°C. Expect roughly 5.4 wet days totalling 75.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Dallas is March–April.
Based on DALLAS FAA AIRPORT, TX US (6.7km), 1995–2024. 30 years of September data.