Recent meteorological model runs from global forecasting centers indicate Shanghai will likely see a daily high near 27°C on May 18 under transitional spring conditions featuring moderate southerly flow and limited cloud cover. Trader consensus reflected in the 32% probability for 27°C, followed closely by 26°C and 28°C, aligns with historical mid-May averages of 24–26°C while incorporating short-term variability from potential afternoon heating or brief showers. Key variables include boundary-layer moisture, wind patterns steering warmer air from the Yangtze River Delta, and any last-minute adjustments in ensemble forecasts that could shift the peak by 1–2°C. New observational data and updated model outputs expected overnight will further refine these probabilities ahead of official resolution.