December in Wellington averages a daily high of 20.1°C with nights around 13.6°C. Expect roughly 10.9 wet days totalling 70mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Wellington is December–March.
Based on WELLINGTON AERO AWS, NZ (5.5km), 1995–2024. 13 years of December data.