Current forecast models from the Met Office and BBC indicate a likely minimum near 12°C in London on August 22, driven by northerly airflow and variable high pressure favoring partial clear skies that promote radiative cooling overnight. Differentiating 11–13°C outcomes hinges on cloud cover thickness, which traps longwave radiation and limits temperature drops, versus wind speeds that enhance mixing with cooler upper air; lighter winds and clearer conditions favor the lower end. An emerging El Niño adds a slightly warmer baseline through elevated sea-surface temperatures, yet local synoptic patterns dominate the short-range outlook. Traders price uncertainty in the next model runs, which will clarify whether showers or increased cloud reduce cooling potential.