September in Galveston averages a daily high of 31.1°C with nights around 24.9°C. Expect roughly 9.3 wet days totalling 171.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Galveston is March–May.
Based on GALVESTON SCHOLES FIELD, TX US (7.3km), 1995–2024. 27 years of September data.