Trader consensus on Polymarket overwhelmingly favors a high of 29°C or higher in Shenzhen on March 20, driven by ensemble forecasts from leading models like ECMWF and GFS, which project daytime highs of 30-32°C amid a persistent high-pressure ridge over southern China. Official data from the China Meteorological Administration corroborates this, citing low humidity, clear skies, and urban heat island effects amplifying temperatures beyond the March historical average of 24-26°C. Recent model runs released March 18-19 show minimal divergence, with 90% of members above 29°C. Realistic challenges include an unexpected southerly sea breeze strengthening marine layer clouds or a late-season cold surge from the north, though probabilities remain under 5% per current outlooks.