December in Mackay averages a daily high of 30.8°C with nights around 22.4°C. Expect roughly 10.9 wet days totalling 156.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Mackay is June–September.
Based on MACKAY AERO, AS (2.4km), 1995–2024. 27 years of December data.