Cairns experiences a tropical climate, specifically a tropical monsoon climate (Am) under the Köppen climate classification.
A wet season with heavy monsoonal downpours runs from November to May, with a relatively dry season from June to October, though light showers can occur during this period.
Cairns' mean annual rainfall is just under 2,000 millimetres (79 in), although monthly totals in the wet season (Dec–Mar) can exceed 1,000 mm (39 in), with the highest rainfall being recorded in any month in January 1981, where over 1,417.4 mm (55.80 in) of rain fell.
Babinda, a town to the south of the city, is Australia's wettest town, recording an annual rainfall of over 4,200 mm (170 in).

Cairns has hot, humid summers and warm winters.
Mean maximum temperatures vary from 26.2 °C (79.2 °F) in July to 31.7 °C (89.1 °F) in January.
Monsoonal activity during the wet season occasionally causes major flooding of the Barron and Mulgrave Rivers, cutting off-road and rail access to the city.
Cairns has 89.7 clear days, annually.
Dewpoint in the wet season (summer) averages at 23 °C (73 °F).
The average temperature of the sea ranges from 23.8 °C (74.8 °F) in July to 29.4 °C (84.9 °F) in January.
Cairns experiences a tropical climate, specifically a tropical monsoon climate (Am) under the Köppen climate classification. A wet season with heavy monsoonal downpours runs from November to May, with a relatively dry season from June to October, though light showers can occur during this period. Cairns' mean annual rainfall is just under 2,000 millimetres (79 in), although monthly totals in the wet season (Dec–Mar) can exceed 1,000 mm (39 in), with the highest rainfall being recorded in any month in January 1981, where over 1,417.4 mm (55.80 in) of rain fell. Babinda, a town to the south of the city, is Australia's wettest town, recording an annual rainfall of over 4,200 mm (170 in).
Cairns has hot, humid summers and warm winters. Mean maximum temperatures vary from 26.2 °C (79.2 °F) in July to 31.7 °C (89.1 °F) in January. Monsoonal activity during the wet season occasionally causes major flooding of the Barron and Mulgrave Rivers, cutting off-road and rail access to the city. Cairns has 89.7 clear days, annually. Dewpoint in the wet season (summer) averages at 23 °C (73 °F). The average temperature of the sea ranges from 23.8 °C (74.8 °F) in July to 29.4 °C (84.9 °F) in January.
Cairns