December in Austin averages a daily high of 18.1°C with nights around 6.5°C. Expect roughly 6.9 wet days totalling 56.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Austin is October–April.
Based on AUSTIN CAMP MABRY, TX US (6.2km), 1995–2024. 30 years of December data.