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Extreme rainfall and flooding in São Paulo

Updated 2 times since CLSTR started tracking revisions of this situation.

What changed

2026-09-15 19:24 UTC → 2026-09-23 14:53 UTC · added removed

São Paulo has experienced recorded its rainiest September since 1943, with heaviest rainfall volumes reaching three times the monthly average. Data from the National Institute of Meteorology (Inmet) shows in 83 years, with the Mirante de Santana station recorded 253.8 reaching 304.6 mm of rainfall, significantly exceeding accumulated rain by late Tuesday. This volume surpasses the monthly historical January average of 292 mm and nearly quadruples the typical September average of 83.3 mm. Attributed by the State Civil Defense The extreme precipitation, initially attributed to the El Niño phenomenon, the extreme was driven by a cold front combined with a polar air mass. The weather has caused significant casualties widespread disruption, including flooding, landslides, and infrastructure structural damage. At least eight deaths Fatalities and one person missing persons have been linked to the heavy rains. In reported, including multiple deaths following the Penha neighborhood, a collapse of an embargoed 12-story residential building under construction—which had been embargoed since 2021—collapsed, resulting in multiple fatalities. the Penha neighborhood. In the Vale do Ribeira region, rising river levels forced 152 families into shelters. Other areas, including Campinas While weather conditions are expected to stabilize with sun and Santo André, have also reported record-breaking rising temperatures by the end of the week, meteorological projections suggest the state will continue to see above-average rainfall levels. As throughout the spring season. The heavy precipitation continues, water levels in metropolitan reservoirs rains have begun also significantly impacted consumer behavior. Data from Shopee indicates a surge in demand for rain-related products compared to rise; the Cantareira system reached 38.2% capacity. While officials project water security through 2026, authorities remain on high alert as saturated soil increases the risk August, including a 380% increase in searches for silicone shoe covers, a 290% increase for pet raincoats, and a 220% rise in searches for clothes dryers. Sales of further landslides umbrellas and inundations. raincoats also increased by more than 250%.

Versions

  1. 2026-09-23 14:53 UTC Extreme rainfall and flooding in São Paulo
  2. 2026-09-15 19:24 UTC Extreme rainfall and flooding in São Paulo
  3. 2026-09-15 18:22 UTC Extreme rainfall and flooding in São Paulo

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