What changed
2026-08-04 22:02 UTC → 2026-08-06 04:33 UTC ·
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In late July, Late July saw São Paulo city experienced enjoy clear skies and warm temperatures, with daytime highs near temperatures around 26 °C and with humidity around near 54 %. Forecasts warned of a an approaching cold front moving in that would lower temperatures and humidity later in the week, bringing cooler temperatures week. The week began with sunny, warm conditions and lower humidity. By early August, a gradual cooling trend as the region was under front moved through Paraná toward southern and western São Paulo. Early August brought a hot, dry air mass. Temperatures rose mass, pushing daytime highs to 27 °C in the capital and up to 34 °C in the municipality of Adamantina, while relative humidity fell to about 30 %. Authorities issued health Health advisories were issued for vulnerable groups and cautioned about possible thunderstorms groups, and isolated heavy showers, noting that thunderstorms were expected, with rain was expected forecast to resume in return to Adamantina later in the week. Overall, By the period shows a transition from a sunny, moderate‑humidity spell with an approaching first week of August, the cold front intensified into an extratropical cyclone, prompting the state’s Defense Civil to a hotter, drier spell with localized rainfall returning issue orange and heightened public‑health then red alerts for wind gusts up to 100 km/h, especially along the coast and flood alerts. in mountainous areas. A crisis cabinet was activated to coordinate response. Rainfall of up to 40 mm raised concerns about flooding, landslides, power outages and hazardous sea conditions, leading authorities to advise residents to secure loose objects and avoid sheltering under trees or metal structures.