December in Galveston averages a daily high of 18.4°C with nights around 11.2°C. Expect roughly 9.6 wet days totalling 91.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Galveston is March–May.
Based on GALVESTON SCHOLES FIELD, TX US (7.3km), 1995–2024. 28 years of December data.