Trader consensus on Polymarket favors a Shanghai high of 18°C (31.5% implied probability) or 19°C (21.5%), driven by the latest ensemble forecasts from ECMWF and GFS models, which project mild conditions under a ridge of high pressure over eastern China. Recent model runs over the past 48 hours indicate warm air advection from the south, with consensus daytime highs in the mid-to-upper teens Celsius, though uncertainty persists due to potential cloud cover variations and timing of any weak frontal passages. Key variables include wind speeds (favoring lighter southerlies for warmer outcomes), soil moisture levels reducing evaporative cooling, and urban heat effects amplifying peaks above 20°C; colder scenarios below 17°C would require unexpected northerly gusts. Daily updates from the China Meteorological Administration expected through March 28 will refine resolution near the event.