Current ensemble forecasts from the China Meteorological Administration and global models project a daytime high of 25–26°C for Beijing on May 18, driven by increased cloud cover and light rain associated with a passing frontal system that limits solar heating compared with the clearer, warmer conditions earlier in the month. Minor differences among model runs center on the precise timing and intensity of showers, which can alter peak temperatures by 1–2°C depending on whether convective activity develops before or after the daily maximum. These factors explain the tight clustering of market-implied probabilities around the 25°C, 26°C, and 27°C outcomes, with traders weighting the latest observational updates and model consensus more heavily as the date approaches.