Official meteorological observations from London-area stations, including Heathrow, recorded a daily maximum of 23°C under partly cloudy skies with southwesterly winds, aligning with Met Office guidance and model consensus for the date. This outcome exceeds the 1991–2020 average high of 20.5°C yet falls well below historical extremes such as the 32.8°C peak from 2016. Trader consensus at 100% implied probability reflects real-time surface data and the absence of late-day warming or measurement discrepancies that could shift the recorded high. Minor adjustments remain possible only if official post-analysis revises station readings, though such changes are rare for well-monitored urban sites.