Recent forecasts from the Met Office and global models indicate overnight lows in London on September 28 will likely range from 12–14 °C, driven by a shift toward more typical late-September conditions after earlier warmth. Light winds, increasing cloud cover, and possible scattered showers limit radiative cooling overnight, keeping minimum temperatures above seasonal averages near 11 °C but below daytime peaks around 19–20 °C. Model consensus shows modest spread due to uncertainties in exact cloud timing and any frontal remnants, with traders assigning the highest implied probabilities to 13 °C and 14 °C outcomes. Updated runs from official agencies ahead of the date will refine these variables and influence further market movement.