Recent Met Office and GFS model runs indicate a minimum near 13°C for London on September 26, driven by high pressure, clear to partly cloudy skies, and light northwest winds that promote radiative cooling overnight. Forecast lows cluster between 12–14°C across sources, consistent with late-September climatology where average minima reach about 12°C at Heathrow. Recent clearing after Friday’s rain has allowed temperatures to dip closer to seasonal norms rather than remaining elevated, tightening trader consensus around the 13°C outcome while leaving modest probability for a 12°C or 14°C reading depending on exact cloud cover and wind timing. Updated model guidance through the evening will refine these probabilities ahead of market resolution.