Current forecast models from sources including the Met Office, GFS, and regional analyses indicate a minimum temperature near 17–18°C for São Paulo on October 5, driven by persistent cloud cover, light rain or showers, and moderate northeasterly winds that limit overnight radiative cooling. These conditions align with spring climatology, where average lows hover around 17°C amid variable moisture from Atlantic influences. Trader sentiment reflects tight spreads between 14°C-or-below and 24°C-or-higher outcomes because model ensembles show modest uncertainty in boundary-layer mixing and exact rainfall timing, which could shift the minimum by 2–3°C either way. Updated runs ahead of resolution will clarify steering patterns and dew-point depressions.