Recent short-term forecasts from major models indicate Shanghai's October 3 high will likely reach 24–25°C under mostly cloudy skies with periods of light rain or showers, creating the near-even market split between those two outcomes. Persistent northeasterly flow and elevated humidity are limiting daytime heating, while the exact timing and intensity of precipitation determine whether the peak edges toward the lower or higher end of that narrow range. Historical early-October averages hover near 23–24°C, providing context for why traders see little probability of extremes. Updated model guidance and official observations from the China Meteorological Administration on the day itself remain the key near-term catalysts that could shift implied probabilities.