Trader consensus on Polymarket has locked in a 100% implied probability for Shenzhen's highest temperature reaching exactly 28°C on May 15, driven by the latest short-range forecasts from the China Meteorological Administration and international models like ECMWF and GFS, which converge on a daytime peak of 28°C amid persistent moderate rain and thick cloud cover from a low-pressure trough over Guangdong Province. Current observations from the Shenzhen Bao'an International Airport station— the market's resolution source—align with this, showing morning temperatures in the low 20s°C rising slowly under humid, overcast conditions cooler than the typical May high of 29.5°C. This positioning reflects high-confidence model agreement on suppressed solar heating, though a realistic challenge could arise from unexpected afternoon clearing allowing a brief 1°C spike to 29°C before evening showers resume; final hourly data releases expected later today could confirm resolution.