Recent forecasts from sources including the Chengdu Meteorological Observatory and international models converge on a daily high of 26–28°C for September 26 under mostly cloudy skies with light showers or drizzle tied to the Huaxi autumn rain regime. Persistent cloud cover and elevated humidity limit surface heating and solar insolation, reducing the likelihood of 30°C or higher readings while supporting the narrow spread between 28°C and 29°C outcomes. Light northeasterly winds offer minimal mixing, and historical September baselines near 26°C provide context for the modest variability traders are pricing. Updated model runs and official station data on the day will resolve the exact maximum.