Latest Met Office forecasts and ensemble model runs indicate a minimum temperature of 13°C in London on June 14, driven by a stable high-pressure ridge suppressing nocturnal cooling while daytime maxima remain near seasonal norms. This consensus aligns with historical mid-June climatology for the region, where overnight lows typically range 11–14°C under similar synoptic patterns, and current surface observations show no incoming cold advection or cloud cover that would alter radiative cooling rates. Trader positioning at 99.2% for 13°C reflects this narrow uncertainty band, as small deviations in urban heat-island effects or station-specific siting rarely shift the recorded daily low outside the 12–14°C window. A sudden marine air intrusion or revised post-midnight observation could still push the outcome to 12°C or 14°C, though both remain low-probability given the current atmospheric setup.