Recent passage of a cold front has introduced cooler, moist maritime air over São Paulo, producing persistent cloud cover, scattered showers, and elevated humidity that limits nocturnal radiative cooling. Official forecasts from sources aligned with GFS and ECMWF models indicate overnight lows near 17–18 °C under these conditions, with light southerly winds and high dew points around 17 °C further moderating temperature drops. Trader consensus reflected in the near-even odds for 17 °C and 18 °C, alongside substantial probability on 16 °C, captures uncertainty in exact minimum timing and cloud-break potential before sunrise on October 12. Final resolution hinges on verified observations from national meteorological networks.