Heat Grips Southeast as Storm Alerts Return in Paraná After Cyclone Moves Offshore

Overview

• São Paulo remains under a municipal heat attention alert with highs forecast above 32–34°C and a daily window for heavy showers and thunderstorms late in the day.
• Inmet logged a 2026 high in the capital on Saturday with a mean maximum of 34.6°C, as humidity and a sea-breeze trigger more frequent late-afternoon storms this week.
• Paraná is under a new storm alert from the state’s Defesa Civil and Simepar today, with risks highlighted for short-duration deluges, damaging gusts, hail in spots, and flash floods.
• The extratropical cyclone that boosted southern instability over the weekend has shifted over the Atlantic, yet residual moisture keeps storms in play across parts of the South and Center-West.
• Mato Grosso do Sul expects moderate to strong showers, especially from the afternoon, with heat persisting, while Inmet projects highs up to 36°C in areas of Minas Gerais such as Juiz de Fora.