Recent forecast models from sources including the Met Office and Yr.no point to overnight lows in São Paulo near 17–19°C on October 6, driven by persistent cloud cover, light rain, and moderate easterly winds that limit radiative cooling overnight. High humidity and showers associated with a passing frontal boundary compress the diurnal temperature range, keeping minimum readings clustered in the mid-to-upper teens Celsius while daytime maxima remain around 22–25°C. Model consensus shows modest spread in exact timing of any clearing, creating the tight clustering of market-implied odds around 16–18°C; any shift in precipitation timing or wind strength could nudge the recorded low by 1–2°C. Updated runs from official agencies over the next 24–48 hours will refine resolution criteria tied to the official INMET station measurement.