Recent Met Office forecasts position 21–22°C as the leading market outcomes for London’s October 3 maximum, reflecting a high-pressure system delivering above-average warmth with light winds and minimal cloud cover that supports daytime highs near 22–23°C. Ensemble guidance shows limited spread, though some runs indicate slightly cooler readings if afternoon cloud thickens or winds shift. This setup exceeds the 1991–2020 average high of 17.6°C for the date, consistent with the broader warm spell across southern England. Resolution will hinge on official observations, likely from a Heathrow or central London station, with the next model updates from the Met Office and ECMWF expected to refine peak timing and any localized cooling effects.