Trader consensus on Polymarket reflects tight clustering around 23–25°C for Shanghai's highest temperature on April 6, driven by the latest China Meteorological Administration ensemble forecasts showing daytime highs in the mid-20s under a building high-pressure ridge over eastern China, which promotes clear skies and enhanced solar heating amid lengthening spring days. Recent observations—such as April 2's 23°C high under cloudy conditions—underscore a warming trend from earlier cooler readings around 16–20°C, with urban heat island effects in Shanghai amplifying peaks. Differentiating factors include variable afternoon cloud cover, potential moderating sea breezes from the East China Sea, and precise timing of maximum insolation, creating model spread that keeps probabilities closely matched. Hourly updates from Shanghai observatories will refine this tomorrow.