Latest Met Office guidance and ECMWF ensemble runs indicate a daytime maximum of 26–27 °C for central London on 16 August under partly cloudy skies and light south-westerly flow following the recent heatwave’s retreat. Atlantic frontal systems approaching from the west are expected to moderate temperatures and introduce a modest chance of showers, keeping values near or slightly above the mid-August climatological average of ~23 °C. Trader consensus clusters on 25–27 °C because model spreads remain narrow on cloud amount and frontal timing; a few extra hours of sunshine or delayed cloud could push readings toward 27 °C, while earlier rain or thicker stratiform cover would favor 25 °C or below. Official resolution will rely on the highest 1-minute reading at the designated London observing site.