Recent Met Office forecasts and numerical weather model consensus established a narrow range around 27°C as London’s most probable daytime maximum on May 30, following the earlier record-breaking heatwave driven by strong southerly flow. A shift to moderate easterly winds and partly cloudy conditions typical of late-May climatology suppressed further intensification, keeping values well below the 30°C threshold observed earlier in the week. Official observations at London City Airport and surrounding stations aligned closely with this guidance, producing the market’s dominant 27°C outcome. Only significant revisions to verified measurements or unexpected local microclimate effects could alter resolution, though current data show high consistency across reporting networks.