Official Met Office observations and forecast model consensus have confirmed an overnight minimum of 16°C as the lowest temperature recorded in London on August 11, 2026, underpinning the market's 100% implied probability for this outcome. A dominant high-pressure system delivered clear to partly cloudy skies and light southwesterly winds that limited radiative cooling, elevating the boundary-layer minimum several degrees above the long-term August average of 13–14°C while daytime highs reached 25–26°C. Ensemble guidance showed tight clustering around this value with minimal spread, reflecting high confidence in the final station readings. Only an unusually sharp wind drop or clearer overnight skies could have allowed further cooling toward 14–15°C, scenarios that did not materialize.