High pressure building over the UK is steering warmer continental air northward, with Met Office guidance indicating a daytime maximum near 28°C for London on August 10 amid mostly sunny spells and light winds. Ensemble forecasts show modest spread around this value because small differences in cloud timing or seabreeze onset can trim peaks by 1–2°C, while stronger subsidence would support 29°C or higher. Recent model runs have kept the most probable outcomes clustered between 26–28°C, consistent with traders’ narrow spread across those bands and limited weight on extremes given the short-range reliability of guidance. Historical August maxima in central London average near 22°C, so the current setup represents a clear positive anomaly driven by the synoptic pattern rather than seasonal norms. Updated runs from the Met Office and ECMWF, plus any revised surface observations, will refine the exact threshold ahead of market resolution.