Current forecast guidance from regional models indicates a likely overnight low near 25–26°C in Shanghai on August 17, driven by persistent subtropical high pressure, elevated dew points near 24°C, and limited nocturnal radiative cooling under partly cloudy skies. Light easterly flow and urban heat retention further constrain temperature drops, while any increased cloud cover or brief showers could shave an additional degree by enhancing downward longwave radiation. Ensemble spreads remain modest at this two-day lead time, with differences among 25°C, 26°C, and 27°C outcomes hinging primarily on precise timing of moisture advection and boundary-layer mixing rather than large-scale pattern shifts. Historical August minima average near 25°C, providing climatological context for the tightly clustered market-implied probabilities. Updated model runs and China Meteorological Administration briefings over the next 24 hours will refine these distinctions.