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5d ago

Brazil Heat Wave Intensifies Across Southeast as São Paulo Sets December Temperature Record

A persistent hot-air dome reinforced by the South Atlantic subtropical high is forecast to keep temperatures unusually elevated into the weekend, heightening health and infrastructure strains.

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Overview

  • Inmet’s orange danger alert for extreme heat remains in effect through 6 p.m. Friday, covering all of the Southeast and parts of the South and Center-West.
  • São Paulo hit 35.9°C at the Mirante de Santana station on Dec. 25, the city’s highest temperature of 2025 and its hottest December reading on record.
  • Rio de Janeiro recorded about 40–41°C this week and is at level 3 of its heat protocol, with 973 probable heat-related medical attendances reported over Dec. 23–24.
  • Greater São Paulo’s water system is under stress, with Sabesp reporting consumption spikes of up to 60% and localized supply interruptions in some neighborhoods.
  • Forecasts point to continued heat through the weekend and a chance of new peaks, including an Inmet projection of up to 37°C in São Paulo on Monday, Dec. 29.