Recent Met Office guidance and ensemble model runs indicate London’s maximum temperature on August 7 will most likely reach 25–26 °C under high pressure, sunny intervals, and light southerly flow. This setup favors modest daytime heating after a recent heat spike, with urban heat-island effects at central sites like Kew potentially adding 1–2 °C over rural values. Small differences in afternoon cloud cover or the precise timing of any weak Atlantic front determine whether readings top out at 25 °C or edge into 26 °C, creating the tight market split. Official resolution will rely on the highest verified reading from designated London stations, with updated guidance expected from the Met Office overnight.