**Official Met Office forecasts for October 13 project a daytime maximum of 21°C in London under a mild southwesterly flow, with sunny intervals developing after morning rain and gusty winds up to 28 mph.** Multiple numerical weather models cluster around 19.7–20.7°C, supporting the market’s strong preference for 21°C (58.5%) and 20°C (26.5%). These values sit well above the 1991–2020 October 13 average high of 16.1°C at Heathrow, reflecting a transient warm anomaly before cooler air arrives later in the week. Traders appear to weigh the risk of rain suppressing the peak against the consensus for peak readings near 20–21°C, with lower probabilities assigned to 22°C or higher. Updated model runs and the next Met Office briefing will likely refine these implied probabilities ahead of resolution.