December in Newcastle averages a daily high of 24.8°C with nights around 18.8°C. Expect roughly 8.8 wet days totalling 53.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Newcastle is August–May.
Based on NEWCASTLE NOBBYS SIGNAL STATIO, AS (2.1km), 1995–2024. 30 years of December data.