Traders see closely matched odds between a lowest temperature of 33°C or higher (47.5%) and around 29°C (46.5%) for Shenzhen on September 30, reflecting uncertainty in overnight cooling under subtropical conditions. Recent forecasts indicate daytime highs near 32–34°C with lows of 27–29°C, driven by persistent southwesterly monsoon flow, high humidity above 70%, and moderating sea breezes from the South China Sea that limit radiative cooling. Light cloud cover and minimal wind overnight could keep the minimum near 29°C, while clearer skies or reduced moisture might allow a brief dip toward 27°C or sustain warmer readings near 30°C. Historical September minima average 24–25°C, but current late-summer patterns favor elevated baselines. Official hourly observations from local stations will resolve the market once September 30 concludes.