Recent ensemble forecasts from global models place Beijing’s May 18 maximum temperature most likely between 25 °C and 27 °C, with the 26 °C and 27 °C outcomes currently favored by traders. A ridge of high pressure over the North China Plain is expected to limit cloud cover and allow moderate solar heating, while a weak cold front and light precipitation signals in some runs could cap afternoon peaks. Historical mid-May climatology shows daily highs averaging near 26 °C with a standard deviation of roughly 3 °C, supporting the tight clustering of market-implied probabilities around these values. Updated model guidance and surface observations over the next 48 hours will determine whether the temperature edges higher or is suppressed by increased moisture and cloudiness.