**Current forecast models from sources like Yr, Met Office, and regional outlooks point to a minimum temperature near 18°C for São Paulo on October 8, driven by clearing skies after recent overcast and rainy conditions that have kept overnight lows elevated around 17–18°C.** Trader sentiment remains closely balanced between sub-13°C and 23°C+ outcomes because of uncertainty in nocturnal radiative cooling rates, variable low-level wind patterns, and urban heat retention, which can shift the exact low by several degrees. Historical October averages near 17°C provide a baseline, but short-term model runs show sensitivity to timing of any clearing and humidity levels ahead of the date. Newer ensemble updates expected in the next 24–48 hours will likely narrow the range as land-sea breeze influences and cloud cover resolve.