Forecast models and recent observations indicate Shanghai's overnight low on August 6 will likely settle near 27–28°C under persistent subtropical high pressure and typical early-August humidity, aligning with the market's heaviest weighting on those outcomes. Climatological baselines show average August minima around 25–27°C, with recent days recording 25–29°C lows amid scattered thunderstorms that can suppress daytime heating and limit nocturnal cooling. Key variables include cloud cover and convective rainfall, which reduce radiative heat loss, versus clearer skies or stronger winds that could push readings toward 26°C or lower. High uncertainty stems from model spread on timing of any showers and subtle steering influences from the East Asian monsoon. Updated National Meteorological Center guidance and high-resolution model runs over the next 48 hours will refine these probabilities ahead of resolution.