December in Cairns averages a daily high of 31.9°C. Expect roughly 14.8 wet days totalling 195.3mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Cairns is June–September.
Based on CAIRNS POST OFFICE, AS (2.1km), 1995–2024. 22 years of December data.