Forecast models for Shanghai on July 23 project overnight lows clustered around 26–29°C amid persistent subtropical high pressure and residual summer monsoon moisture, with thundershowers expected to limit clear-sky radiative cooling and keep minimum temperatures elevated. Historical July climatology places average lows near 26–28°C, while current conditions show high humidity and urban heat-island effects that reduce overnight temperature drops. Trader consensus across closely matched probabilities for 27–29°C reflects uncertainty in the precise timing and intensity of precipitation, which can alter boundary-layer mixing and surface heat retention by several degrees. New model runs and official updates from regional meteorological agencies in the next 48 hours will likely refine these outcomes.