December in Geelong averages a daily high of 24.8°C with nights around 12°C. Expect roughly 6.6 wet days totalling 29.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Geelong is November–April.
Based on AVALON AIRPORT, AS (16.7km), 1995–2024. 28 years of December data.