Recent forecast guidance from the China Meteorological Administration and ECMWF ensembles indicates persistent cloud cover and scattered showers across the Pearl River Delta on May 17, moderating daytime heating and anchoring the most likely high near 27°C. Elevated humidity near 80 percent combined with light southerly flow from the South China Sea limits surface warming below the mid-May climatological average of 29–30°C. Ensemble model spread centers on 26–28°C depending on rainfall timing and afternoon clearing, with only modest upside potential if skies partially break. This setup explains the tight clustering of trader-implied odds around those three outcomes while keeping higher temperatures below 10 percent probability. Updated CMA briefings and local observations tomorrow will provide the final inputs before resolution.