A powerful cold front intensified by El Niño has brought intense cold to Southern and Southeastern Brazil and rain to the Northeast [1].

This weather pattern is significant because it has triggered historic temperature drops in urban centers and extreme freezes in rural agricultural zones, disrupting typical seasonal norms across multiple states.

Meteorological agencies said temperatures fell below 0°C in parts of Santa Catarina and Rio Grande do Sul [2]. The cold front also pushed temperatures below 10°C in the Southeast region [3].

In São Paulo, the impact was particularly severe. The city recorded its coldest June afternoon in 30 years [4]. While some reports indicated a gradual rise in temperatures for the Southeast in the following days, other forecasts warned of continued low temperatures as the front moved through the region [3, 4].

Precipitation has also been a primary feature of this system. The Southeast saw rainfall reaching up to 100 mm [3]. The weather system extended its reach to the Northeast, bringing rain to areas including Rio Branco [1].

These conditions occurred between mid-May and late June 2026, with specific alerts issued on May 21 and June 26 [2, 4]. The synergy between the cold front and the El Niño phenomenon amplified the temperature drop, creating a volatile weather window for the center-south of the country [1, 3].

“São Paulo recorded its coldest June afternoon in 30 years”

The intersection of a strong cold front and the El Niño phenomenon creates atmospheric instability that can lead to record-breaking temperature anomalies. When major urban hubs like São Paulo experience three-decade lows, it suggests a shift in regional climate patterns that may impact energy demand for heating and agricultural yields in the South.