Recent China Meteorological Administration ensemble forecasts converge on a daily maximum of 31–32°C for Beijing on June 18, aligning with the market’s tight split between those two outcomes. Short-range model runs reflect modest uncertainty from variable afternoon cloud cover, boundary-layer mixing, and localized urban heat effects that can shift the peak by 1°C. June climatology places typical highs near 30–31°C, with current steering patterns and weak pressure gradients limiting stronger advection or convective cooling. Traders weigh these factors against potential model bias in resolving exact timing of any diurnal maximum, keeping probabilities closely matched ahead of final observational data.