São Paulo breaks another heat record for the year, with the highest December temperature in 64 years

The city of São Paulo broke a new heat record in 2025, with thermometers indicating 37.2°C at 4 p.m., recorded at the Mirante Santana meteorological station of the National Institute of Meteorology (Inmet), north of São Paulo. The maximum exceeded this year’s record recorded on Friday 26, at 36.2ºC.

The temperature was also the highest recorded for a December day in 64 years. The previous record was 35.6°C on December 3, 1961. Measurements at the Mirante de Santana conventional station began in 1943.

According to the Climate Emergency Management Center (CGE)the heat well above average mainly predominates in the afternoon on the capital of Paulista and neighboring towns, and the early mornings continue with a sultry feeling.

In the capital São Paulo, according to Meteoblue, temperatures begin to drop from January 1, when the expected maximum should be 29ºC and the rains should return with more intensity. With the precipitation, it is expected that on January 4 the maximum will be around 24ºC.

Heatwave danger warning

Inmet has issued a red heatwave warning in effect until Monday 29 for the states of São Paulo, Rio de Janeiro, parts of Espírito Santo, Minas Gerais, Goiás, Mato Grosso do Sul, Paraná and Santa Catarina.

For next week, the forecast also includes strong storms in the state of São Paulo. Between Monday 29 and Tuesday 30, between 20 and 50 millimeters of rain per day, strong winds, thunderstorms and risks of hail are expected, especially in the regions of Presidente Prudente, Marília, Itapeva and Registro.

Taking into account the forecasts, the State Government will set up a crisis office from Monday 29, with the aim of coordinating preventive actions and serving municipalities. The government also called for an “immediate reduction” in water consumption, with reservoirs facing a decline in volume in recent months.

High temperatures in several regions of Brazil are linked to atmospheric blocking, which makes it difficult for weather systems to function and favors the persistence of heat, especially in the Southeast.