A cold front is expected to lower temperatures across Brazil's Centro-Sul region this weekend after a period of unseasonal heat [1].
This shift marks the arrival of the first significant cold wave of the winter season. The transition from extreme warmth to cooler air can create volatile weather patterns, including potential cyclones, affecting millions of residents in the country's central and southern territories [2, 3].
An unseasonal heat wave, known locally as a *veranico*, is forecast to persist through Thursday, June 23, 2026 [1]. During this period, maximum temperatures remain high in several major cities. Forecasters expect Cuiabá to reach 35 °C [1], while Rio de Janeiro and Palmas are projected to hit 32 °C [1]. São Paulo is expected to see a maximum of 28 °C [1].
The weather pattern is expected to shift Thursday night, June 23, 2026, as the cold front arrives [2]. This system will bring a drop in temperatures and potential precipitation through the weekend of June 24-26, 2026 [3].
Some reports indicate that the cold air will not reach all regions simultaneously. While the general trend is a decrease in temperature, some areas of Minas Gerais have already shown rising maximums, suggesting the front's arrival is staggered [3]. Other forecasts suggest the most significant cooling, accompanied by drizzle and rain, may not fully settle until Tuesday, June 25 [3].
"The first cold wave of winter should begin this weekend and will bring down temperatures in the Center-South," the G1 editorial team said [2].
Additional meteorological reports highlight the complexity of the incoming system. The MSN Brasil weather desk said a cold front and cyclone will act across Brazil over the weekend, driving the temperature drop [3]. Jovem Pan News said that the intense heat must persist until Thursday, June 23, when the new front begins to lower temperatures [1].
“The first cold wave of winter should begin this weekend and will bring down temperatures in the Center-South.”
The rapid transition from a 'veranico' heat wave to a winter cold front indicates high atmospheric instability in the Centro-Sul region. The mention of cyclones accompanying the cold front suggests a risk of severe weather beyond simple temperature drops, which may impact regional infrastructure and agriculture during the early winter months.
