Persistent rain and cloud cover from Typhoon Zitan remnants and the active South China Sea monsoon trough are keeping overnight lows near 26–27 °C through 27 August, creating tight market spreads between the 27 °C, 26 °C, and 22 °C-or-below bins. Official Shenzhen Meteorological Bureau guidance shows rainfall easing on the 28th with daytime highs rising toward 31–32 °C, yet lingering moisture and reduced insolation could still limit nighttime radiational cooling and hold the minimum near or below 27 °C. Ensemble guidance remains split on the exact timing of any clearing, producing the observed 45–48 % clustering around these thresholds; traders are therefore weighting the next 48-hour model runs and surface observations for resolution signals ahead of the 28 August minimum-temperature window.