Current forecasts for Guangzhou on September 1 indicate daytime highs near 31–32°C and overnight lows of 23–25°C under persistent high humidity, scattered thunderstorms, and moderate winds from the north, consistent with late-summer monsoon patterns and the historical September average low near 25°C. Active rain systems and thick cloud cover over the past 48 hours have limited radiative cooling, supporting the elevated low-temperature odds reflected in market-implied probabilities near 25°C. Model consensus points to continued moisture and variable steering flows that could either sustain cloudiness (favoring milder minima) or allow brief clearing (permitting greater nighttime heat loss). This scientific uncertainty around cloud persistence, humidity levels, and wind-driven mixing explains the closely matched trader sentiment between warmer and cooler extremes. Updated regional model runs and official Guangzhou Meteorological Observatory briefings over the next 24–48 hours will likely refine the overnight minimum ahead of market resolution.