Beijing's short-term numerical weather forecasts show a spread across 34–37°C for the July 15 daily maximum, reflecting model disagreement on the strength and position of the western Pacific subtropical high and monsoon moisture transport. Clear, subsiding air under a stronger ridge favors 36–37°C readings, while increased cloud cover, scattered thunderstorms, or a slight southward rain-belt shift could cap the peak near 34–35°C. The urban heat-island effect and seasonal July climatology (historical midsummer highs clustering 31–35°C) underpin the market’s concentration around these brackets, with lower probabilities for extremes reflecting limited potential for either strong cold advection or record heat in the current pattern. Updated CMA and global model runs over the next 48 hours remain the key near-term catalysts.