January in Mackay averages a daily high of 30.8°C with nights around 23.4°C. Expect roughly 14.1 wet days totalling 247.5mm. 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. 26 years of January data.