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Teresina, the capital of Piauí state, sits inland in northeastern Brazil, on a plain between two rivers well away from the coast, at approximately 5.09°S, 42.80°W. Its interior position, cut off from the cooling sea breezes, gives it a hot tropical climate (Köppen Aw) — one of the hottest cities in Brazil — with a wet season and a long, intensely hot dry season.
The wet season, from around December to April, brings the year's rain in heavy afternoon thunderstorms, with highs around 32–34°C and higher humidity; the cloud and rain offer some relief from the heat. Even so, Teresina is consistently hot, and its inland setting, without the sea breezes that cool the coastal northeast, makes it one of the hottest state capitals in the country.
The dry season, from around June to November, is hot, sunny and very dry, with highs often reaching 35–37°C or higher and lower humidity, earning the city its nickname 'Chapada do Corisco' and a reputation for searing heat. Nights are warm, rain is scarce for months, and the relentless sun makes this the most punishing time of year.
Teresina receives on the order of 1,300–1,400 mm of rain a year, concentrated in the wet season from December to April, with a peak around February and March, while the June-to-November dry season is nearly rainless. Live rainfall, humidity, and pressure readings for the city are shown in the panels above.
Teresina's inland position is the key to its climate: without the sea breezes that temper the coastal northeast, it endures some of the most intense, sustained heat of any Brazilian city, especially in the long dry season when temperatures routinely climb into the high 30s. The sharp split between a thundery wet season and a searing dry season defines the year.
To follow any single measurement in Teresina 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.