Forecast models from the Met Office and European Centre for Medium-Range Weather Forecasts indicate a shift toward cloudier, cooler conditions across southern England by August 19, with overnight radiative cooling potentially limited by increased cloud cover and light winds, supporting minimum temperatures near 14–15 °C. Trader consensus clustering at 16–17 °C reflects uncertainty in the precise timing of any frontal passage and the degree of clear-sky cooling, factors that can swing the daily low by 1–2 °C. Historical August climatology for London shows typical minima around 14 °C, providing context for the current model spread. Updated guidance expected within the next 24–48 hours from official agencies will likely refine these probabilities ahead of market resolution.