Recent China Meteorological Administration guidance highlights lingering low-pressure influences over the Pearl River Delta, producing variable cloud cover and scattered showers that moderate daytime heating and position 27–28°C as the most probable peak temperatures for Shenzhen on May 18. Ensemble model spreads center on rainfall timing, where earlier or heavier showers could suppress the high to 27°C while partial afternoon clearing might permit brief warming to 28–29°C. May climatology shows typical highs near 29.5°C, yet current humidity levels and reduced insolation create a 1–2°C cooling bias relative to historical averages, leaving traders focused on the next model updates to resolve the narrow probability gap between these adjacent outcomes.