Trader consensus on Polymarket reflects tight uncertainty in numerical weather prediction models for Shanghai's March 29 high temperature, with GFS and ECMWF ensembles centering implied probabilities around 17–19°C amid clustered outcomes at 28.5% for 18°C, 23% for 19°C, and 21% for 17°C. Recent model runs over the past 24 hours show a weak high-pressure ridge over eastern China steering mild southerly flow, boosting forecasts above the late-March climatological average of 14–16°C, while urban heat island effects and partial cloud cover introduce ±1–2°C variability in peak hourly readings. No major shifts from yesterday's updates, but intraday observations from China Meteorological Administration stations will sharpen resolution as the date nears, with low odds for extremes due to stable synoptic patterns lacking cold outbreaks or heat waves.