Current forecasts indicate a warming high-pressure regime over southern England, with clear skies and light winds favoring radiative cooling overnight ahead of August 9. Ensemble guidance from models such as ECMWF and UKMO points to minimum temperatures clustering around 16–17 °C in central London, consistent with the closely matched market-implied odds for those outcomes. Recent observations show daytime maxima climbing toward 28–29 °C under predominantly dry conditions, which reduces cloud cover and amplifies the diurnal range. Key variables differentiating the leading probabilities include local urban heat-island effects, exact timing of any weak frontal passage, and resolution of small model spread in boundary-layer moisture. Updated short-range runs expected within the next 24–48 hours will narrow the range further.