A 'wet season' or 'rainy season' is a
season in which the average
rainfall in a region is significantly increased. The term ''green season'' is also sometimes used as a
euphemism by
tourist authorities.

Wet Season storm at night in Darwin, Australia
These terms are commonly used describing the weather in the
tropics. Tropical weather is dominated by the movement of the
tropical rain belt, which
oscillates from the northern to the southern tropics over the course of the year.

The wet season in
Cairns can be seen in this graph
The tropical rain belt lies in the southern hemisphere roughly from October to March, and during this time the southern tropics experience a wet season, in which rain is common. Typically, days start off hot and sunny, with humidity building during the day and culminating in large
thunderstorms and torrential rain in the afternoon or evening. From April to September, the rain belt lies in the northern hemisphere, and the northern tropics experience their wet season.
The rain belt reaches roughly as far north as the
Tropic of Cancer and as far south as the
Tropic of Capricorn. Near these latitudes, there is one wet season and one dry season annually. On the equator, there are two wet and two dry seasons as the rain belt passes over twice a year, once moving north and once moving south. Between the tropics and the
equator, locations may experience a short wet and a long wet season. Local geography may also substantially modify these climate patterns.
Video footage
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Wet season in Bamako
See also
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Akhet
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ITCZ
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Dry season
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Monsoon
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Monsoon trough