Recent numerical weather prediction models from the China Meteorological Administration and international ensembles indicate Beijing’s highest temperature on May 17 will most likely reach 19–20 °C under partly cloudy skies and light southerly flow. These forecasts, which incorporate surface observations, upper-air data, and ensemble spreads, place the market-implied probabilities at 43% for 19 °C and 32% for 20 °C because historical analogs and current atmospheric conditions support modest daytime warming without significant frontal passages or strong insolation. Traders weigh the inherent uncertainty in short-range model guidance, where small shifts in cloud cover or wind could nudge the peak by one degree, against the limited time remaining before official resolution.