Inmet Extends Heat Alerts in Brazil’s Center‑South as São Paulo Sets December Record

Overview

• Inmet warnings cover all of the Southeast and parts of Paraná, Santa Catarina, Goiás and Mato Grosso do Sul, with some advisories extended to Monday and red “great danger” notices reported in areas including São Paulo and Rio de Janeiro.
• São Paulo hit 35.9°C at the Mirante de Santana station on December 25, the city’s highest December reading on record and the hottest day of 2025, with forecasters expecting highs near the mid‑30s through Sunday.
• Rio de Janeiro reached about 41°C this week and the city moved to heat stage 3, as municipal health services reported 973 heat‑related attendances over December 23–24.
• Authorities reported strain on infrastructure, including a roughly 60% jump in water demand in parts of Greater São Paulo, and urged hydration, limited sun exposure and care for vulnerable groups.
• Meteorologists highlight broad exposure across the Southeast and adjacent areas, with forecasts pointing to persistent heat and localized storms in the South that could bring some relief after the peak.