The wet season lasts from November to April, and is characterized by heavy rainfall, high humidity, and occasional cyclones. The average temperature during the wet season is around 28°C (82°F), with highs of up to 35°C (95°F) and lows of around 22°C (72°F). The humidity is typically above 80%, and rainfall can be as high as 1,500 mm (59 in).
The dry season lasts from May to October, and is characterized by hot, dry weather. The average temperature during the dry season is around 32°C (90°F), with highs of up to 38°C (100°F) and lows of around 20°C (68°F). The humidity is typically below 50%, and rainfall is very rare.
January is in the middle of the wet season in Darwin, so you can expect hot, humid weather with a high chance of rain. The average temperature in January is around 29°C (84°F), with highs of up to 35°C (95°F) and lows of around 23°C (73°F). The humidity is typically above 80%, and rainfall can be as high as 400 mm (16 in).