Recent forecasts from Chinese meteorological sources indicate a transition to cooler conditions in Beijing on September 24, driven by shifting winds from southerly to northerly flows and the approach of a frontal system that favors light rain and increased cloud cover. This setup reduces daytime solar insolation and promotes evaporative cooling, with model consensus pointing to a daily maximum near 26–27°C amid 50–60% precipitation probability and totals around 2 mm. The closely matched market-implied odds for 25°C versus 26°C reflect uncertainty in the precise timing and intensity of rain onset, as well as minor variations in boundary-layer mixing and urban heat retention, which can alter peak readings by 1–2°C relative to climatological September norms of roughly 24–26°C. Updated model runs and official briefings in the next 24–48 hours will likely refine these thresholds.