A polar air mass is maintaining cold temperatures across southern and southeastern Brazil on Tuesday, June 25, 2026 [1].
This weather shift is significant because the intensity of the cold front threatens agricultural yields through potential frosts and disrupts daily transit with increased precipitation.
Meteorologist Paula Nobre said the cold remains persistent in the South and Southeast regions [1]. The weather pattern brings a high probability of rain to the South and increased cloud cover across the Southeast [1], [2].
The arrival of the polar air mass has caused a sharp decline in temperature. Some areas have seen drops of up to 10°C [5], with temperatures falling below five°C in certain regions [5]. Reports indicate that some areas in the South have experienced negative temperatures [6].
MetroPoles said the mass of polar air is causing intense cold and the possibility of frost in elevated areas of the South [3]. This combination of high humidity and falling temperatures is the primary driver of the current conditions [2], [4].
While the southern half of the country faces these frigid conditions, the Central-West region remains hot [7]. The contrast highlights the strength of the current frontal system moving across the continent.
Canal Rural said the cold front increases the chance of rain in the South and Southeast this Tuesday [2]. Local authorities continue to monitor the impact of the temperature drop on public health and infrastructure in the affected states.
“Temperatures below 5°C in some regions and possibility of frost”
The presence of a polar air mass during June aligns with the Southern Hemisphere's winter season, but the severity of the temperature drop—reaching negative values in some southern sectors—indicates a strong atmospheric push. This creates a stark climatic divide between the frozen south and the warm Central-West, potentially impacting regional logistics and crop stability in Brazil's agricultural heartlands.
