Current forecasts from the Met Office and ensemble models indicate a high of 22°C for London on October 4, 2026, under mostly cloudy conditions with light westerly winds and no significant precipitation. This aligns with observed afternoon readings near 21–22°C and places the outcome well within the typical late-September to early-October range, where daily maxima average around 17–18°C but can reach the low 20s during stable high-pressure setups. Trader consensus at near-100% implied probability reflects the tight clustering of official guidance and limited upside or downside risk from model spreads. A rapid shift in steering flow or unforecasted clear-sky radiative warming could still push the peak marginally higher or lower before close of observations.