Trader consensus on Polymarket reflects tight uncertainty in short-range forecasts for Shenzhen's May 15 high temperature, with implied probabilities clustered at 32.5% for 30°C or higher, 29.5% for 29°C, and 27.5% for 28°C, driven by the China Meteorological Administration's latest guidance projecting thundershowers and a 29°C peak amid heavy cloud cover and morning thunderstorms. Recent observations show a sharp drop from 31–32°C highs on May 12–13 due to an advancing rain system linked to early monsoon influences, introducing convective instability from high humidity (dew points near 24°C) that limits solar heating. Differentiating factors include timing of precipitation—early showers cap peaks at 28°C per ECMWF ensembles, while delayed clearing or urban heat island effects could push toward 30°C as in some GFS runs. Updated model outputs and Bao'an Airport observations will clarify resolution tomorrow.