September in Grand Prairie averages a daily high of 31°C with nights around 19.9°C. Expect roughly 5.7 wet days totalling 78.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Grand Prairie is March–May.
Based on ARLINGTON SIX FLAGS, TX US (7.2km), 1995–2024. 21 years of September data.