Recent Met Office forecasts position a 21°C high as the leading outcome for London on October 13, driven by mild southwesterly flow and clearing skies after morning rain that allow peak afternoon warming under sunny intervals. Ensemble models show consensus around 20–21°C maxima, well above the 16.1°C long-term average for the date, with limited potential for 22°C if clearing occurs earlier or winds remain lighter. Trader positioning reflects this guidance, tempered by residual uncertainty in exact timing of frontal passage and localized cloud effects that could cap readings near 20°C. Updated model runs and official briefings over the next 12–24 hours will refine resolution thresholds ahead of the daily maximum observation.