Official forecasts from the UK Met Office and supporting models indicate a maximum temperature of 21–22°C for London on October 1 under sunny intervals, light westerly winds, and dry conditions, with afternoon readings already approaching 20°C at key stations. This aligns with the market's near-certain 22°C outcome, reflecting high-pressure dominance that has suppressed typical early-October cooling and delivered above-average warmth. Historical baselines for the date average closer to 18–19°C, underscoring the current anomaly driven by stable atmospheric patterns. Resolution hinges on official station maxima; late-day cloud build-up or localized cooling could cap readings at 21°C, though model consensus makes such shifts unlikely before evening.