December in Tarneit averages a daily high of 24.3°C with nights around 12.5°C. Expect roughly 7.3 wet days totalling 42.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Tarneit is November–April.
Based on LAVERTON RAAF, AS (8.8km), 1995–2024. 30 years of December data.