On Sunday, October 8, São Paulo officially entered a state of attention in response to severe weather conditions, with the city's emergency management agency declaring the alert as rainfalls began to intensify. As of 1:14 PM, the weather system, fueled by warm and humid air, resulted in moderate to heavy rainfall across various parts of the city, particularly affecting the western, central, and northern zones. Areas near Ibirapuera in the southern zone also experienced rainfall, raising concerns about potential flooding and wind gusts.

The Centro de Gerenciamento de Emergências Climáticas (CGE) has warned residents that the rain is expected to continue sporadically, with isolated showers potentially leading to flooding conditions. The agency's communication emphasizes the need for caution due to the unpredictable nature of the weather, as the meteorological conditions involve complex interactions between coastal maritime winds and instability from the interior regions of the state. Forecasters suggest that this pattern of humid weather will persist through the beginning of the week.

With ongoing heavy rain poses risks not only for immediate flooding but could also potentially affect transportation and infrastructure in São Paulo, a city with a history of challenges in managing urban flooding. As such, public advisories urge residents to remain vigilant and prepared for adverse weather impacts. The expectations of continued instability and rain underline the necessity for ongoing monitoring of the situation as conditions develop.