Latest ensemble forecasts from global and regional models show Beijing under stable high pressure with light easterly flow and mostly clear to hazy skies on October 2, supporting peak temperatures near the 22.9°C climatological average. Minor differences in boundary-layer mixing, afternoon solar heating, and urban heat retention create the narrow spread between 23°C and 24°C implied probabilities. Current runs favor a brief window for readings to reach 24°C before any evening cooling or haze thickens, while slight downward revisions in some guidance keep 23°C competitive. Traders are weighting the most recent model consensus and historical analogs for early-October clear days when assigning the tight 46.5%–41.5% split.