A polar air mass is bringing an intense cold wave across large parts of Brazil this Wednesday, June 24, 2026.
The sudden drop in temperature threatens agricultural yields and public health in the Southern and Southeastern regions, where frost risk is high.
The cold front is driven by a polar air mass moving southward across the continent [1]. This system is bringing widespread rain and a significant risk of frost to much of the country [1].
In the Southern states of Rio Grande do Sul, Santa Catarina, and Paraná, temperatures are expected to fall below 0°C [1]. Some forecasts indicate that temperatures in these southern regions could drop as low as -10°C [2].
The Southeast is also experiencing a sharp decline in temperature. In São Paulo, the maximum temperature is expected to reach only about 14°C [1]. Other areas within São Paulo, Minas Gerais, Rio de Janeiro, and Espírito Santo may see temperatures drop below 10°C [3].
Meteorologists said the effects of this weather system will continue into Thursday, June 25, 2026 [1]. The combination of low temperatures and moisture has created a volatile environment for residents in the affected states, particularly those in high-altitude areas prone to freezing.
Local authorities are monitoring the situation as the cold front moves through the region. The intensity of the polar air mass has triggered alerts for severe cold in the most southern latitudes of the country [2].
“Temperatures in these southern regions could drop as low as -10°C”
The arrival of a polar air mass during the Southern Hemisphere's winter solstice period indicates a strong atmospheric shift. When temperatures drop below 0°C in the South and reach single digits in the Southeast, it can lead to significant crop damage from frost and increased energy demand for heating in urban centers like São Paulo.
