Recent forecasts indicate Shanghai's overnight low on October 3 will likely settle near 19–20°C amid a frontal system bringing clouds and rain, yet market odds remain nearly even between 16°C or below and 26°C or higher due to uncertainty in cold-air advection timing and intensity. A shortwave trough and northerly flow are driving the pattern, with stronger cooling possible if winds weaken and skies clear enough for enhanced radiative heat loss after precipitation ends. Historical early-October averages hover near 17°C, but model spread on boundary-layer mixing and exact frontal passage keeps trader sentiment balanced. New guidance from regional meteorological agencies on steering flow and cloud cover will likely refine these probabilities ahead of resolution.