Under the Köppen climate classification, Cuiabá has a tropical savanna climate (Köppen: Aw). Cuiabá is famous for its searing heat, although temperatures in winter can sometimes drop to . This is atypical, caused by cold fronts coming in from the south, and may only last one or two consecutive days then returning to the usual heat. The climate is tropical and humid. Rainfall is concentrated from October to April, the mass of dry air over the center of Brazil inhibiting the rain formation from May to September. The cold fronts dissipates the heat associated with the smoke produced by fires lit on during the dry season. The relative humidity drops to very low levels, sometimes below 15%, increasing cases of respiratory diseases. The average annual rainfall is , with maximum intensity from December to March. The mean maximum temperature reaches , but the absolute maximum can reach in hotter months but is muffled on rainy days, when the maximum temperature is typically only . The average low in July, the coldest month is with wind chill of .Temperature in Cuiabá
