A polar air mass from Antarctica has moved into southern Brazil, causing the first sharp temperature drop of 2026 [1].
This weather event disrupts regional stability by introducing extreme temperature swings during the Mother's Day weekend, impacting millions across the southern states of Rio Grande do Sul, Santa Catarina, and Paraná [1], [2].
In the city of Bagé, Rio Grande do Sul, temperatures fell to 12°C at midday on Saturday [1]. This figure represents a drop of approximately 15°C compared to the temperature recorded at the same time on Thursday, April 7, 2026 [1].
Meteorologists attribute the sudden chill to a powerful atmospheric flow. "It is a potent air mass coming from Antarctica and, according to the direction of the winds, it is invading South America," a narrator for CNN Brasil said [1].
While the impact was severe in Rio Grande do Sul, other regions are also experiencing the effects of the front. Reports from MSN Brasil indicate that the cold front is bringing intense changes, and moderate to heavy rains, to Santa Catarina and Paraná [2].
The movement of this Antarctic air is driven by specific wind patterns that push cold air northward into the South American continent [1]. This system has created a stark contrast in weather patterns across the southern region this week.
“Temperatures in Bagé fell to 12°C at midday on Saturday.”
The arrival of a potent Antarctic air mass in May indicates a volatile transition in seasonal weather patterns for southern Brazil. The significant temperature delta between early April and mid-May suggests an intensifying polar flow that can lead to sudden agricultural disruptions and public health challenges in the southern states.
