Latest ensemble forecasts from global and regional models, including GFS runs, show Beijing's maximum temperature on September 26 most likely reaching 26–27°C under partly cloudy to rainy conditions driven by a weak frontal system and easterly flow. This consensus underpins the market's tight clustering around those outcomes, with 27°C edging ahead at 33.5% implied probability. Cloud cover and scattered showers are expected to limit afternoon heating, while light winds and high humidity moderate peaks below historical late-September averages near 25°C. Minor model spread in precipitation timing creates the narrow edge between 26°C and 28°C scenarios, with traders weighting official China Meteorological Administration guidance and updated model outputs ahead of the day's resolution.