Traders see closely matched probabilities across 23–30°C for Shanghai’s daily minimum temperature on August 2 because short-range forecast models show overnight lows clustered near 27–28°C amid typical subtropical summer conditions. Key variables include the strength of radiative cooling under variable cloud cover, humidity levels near 75–80 percent that limit temperature drops, and any influence from weak monsoon flows or distant typhoon remnants that could enhance mixing or bring brief showers. Historical August averages place daily minima around 25–27°C, with urban heat-island effects in Shanghai often keeping readings several degrees above rural baselines. New model runs and updated guidance from agencies such as the China Meteorological Administration in the next 24–48 hours will likely tighten the distribution as land-sea breeze patterns and boundary-layer moisture become clearer.