Recent official forecasts from the Met Office and European models converged on a peak of 34°C for central London on August 13 under persistent high-pressure subsidence and southerly flow advecting warm air from the continent. This consensus, reinforced by ensemble runs showing limited diurnal variability and no significant convective cooling, underpins the market’s near-certain positioning at 34°C. Historical August baselines and current soil-moisture deficits further supported expectations of reaching but not substantially exceeding that threshold before resolution criteria are met. Uncertainties remain around localized urban heat-island effects or last-minute model adjustments that could shift the recorded maximum by 1–2°C at official stations.