Meteorological services forecast rain for Brazil’s South and Southeast regions on Monday, May 25, 2026 [1].
The weather patterns are driven by a cyclone and two low-pressure systems. These atmospheric conditions bring the risk of strong winds, hail, and heavy storms to densely populated areas.
The Instituto Nacional de Meteorologia (INMET) said the weather should remain stable in most of the country on Monday, with the exception of the North and Center-West [3]. However, the southern states of Rio Grande do Sul, Santa Catarina, and Paraná are facing significant instability [1, 2].
In the Southeast, São Paulo and Rio de Janeiro, along with parts of Minas Gerais, are expected to see continued rainfall [1, 2]. The impact includes a notable drop in temperature. Specifically, forecasts indicate maximum temperatures of only 18°C for São Paulo [4].
Reports from Click Petróleo e Gás said rain and cold are advancing in the South and São Paulo, with storms hitting Paraná and Santa Catarina accompanied by wind gusts [4]. The combination of these low-pressure systems creates a volatile environment for transportation and outdoor activity in these regions [2].
Local authorities continue to monitor the movement of the cyclone to mitigate potential flooding or wind damage. While the rest of the nation remains largely stable, the concentration of these three systems in the south creates a localized weather emergency [1, 3].
“Rain and cold advance in the South and São Paulo, with storms in Paraná and Santa Catarina.”
The simultaneous presence of a cyclone and two low-pressure systems indicates a high degree of atmospheric instability. This convergence increases the likelihood of severe weather events, such as hail and flash flooding, which can disrupt infrastructure and logistics in Brazil's industrial hubs of the South and Southeast.
