Recent short-range forecasts from major models indicate London’s minimum temperature on August 23 will likely fall between 12–14 °C, aligning with the market’s clustering around those outcomes. A cooling trend after mid-August warmth, driven by increased cloud cover and a weak Atlantic front, has reduced radiative cooling potential while keeping daytime highs near 20–22 °C. Key variables include overnight cloud fraction (clear skies favor deeper cooling toward 11 °C or below), wind mixing that limits cold-air pooling, and urban heat-island effects that typically add 1–2 °C in central London. Model spread and the two-day lead time sustain the observed uncertainty, with traders weighting ensemble consensus and any updated Met Office guidance expected before resolution.