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Goiânia, the capital of Goiás state, sits inland on the central Brazilian plateau at around 750 metres above sea level, in the tropical savanna (cerrado) of central-west Brazil at approximately 16.68°S, 49.25°W. It has a tropical savanna climate (Köppen Aw) — warm year-round — with a very sharp division between a wet summer and an intensely dry winter, typical of the cerrado. Being in the Southern Hemisphere, its seasons are reversed relative to the Northern.
Summer, from October to April, is warm and the rainy season, with highs around 30–31°C and warm nights, the altitude keeping the heat from becoming extreme. This is when nearly all of the year's rain falls, in frequent afternoon and evening thunderstorms that green the cerrado, with high humidity and abundant cloud. December and January are among the wettest months.
Winter, from May to September, is warm, extremely dry and sunny, with highs around 29–31°C but cool nights that can drop to around 12–14°C. The dry season is severe: humidity can fall to very low levels, the air becomes hazy, and weeks pass with no rain at all, leaving the landscape parched and raising the risk of bushfires — a marked contrast to the lush wet season.
Goiânia receives on the order of 1,400–1,500 mm of rain a year, overwhelmingly concentrated in the wet season from October to April, while the winter months from June to August are almost completely rainless — among the most sharply seasonal rainfall patterns in Brazil. Live rainfall, humidity, and pressure readings for the city are shown in the panels above.
Goiânia's weather is defined by the extreme seasonality of the cerrado: a green, thundery, humid summer wet season gives way to a long, intensely dry winter when humidity plunges, the air turns hazy and dusty, and the risk of grassland and bush fires rises sharply. The very low winter humidity is a notable feature, sometimes dropping to desert-like levels.
To follow any single measurement in Goiania more closely, use our live instruments: the online barometer for atmospheric pressure, the thermometer for temperature, the hygrometer for humidity, the anemometer for wind speed, the wind vane for wind direction, and the rain gauge for rainfall.