Latest Met Office guidance and ensemble models point to a daytime maximum of 20–22°C in London on August 29, with persistent cloud cover, southwesterly winds, and periods of rain limiting solar heating and keeping values near seasonal norms. The slight edge for 21°C in trader pricing reflects model consensus on peak readings during any brief afternoon lull in showers, while the close spread across 20–22°C underscores uncertainty in exact timing of precipitation and boundary-layer mixing. Atlantic low-pressure systems dominate the pattern, suppressing the warmer, clearer conditions seen earlier in the month and reducing the likelihood of readings above 23°C. Updated high-resolution runs expected overnight will further refine the precise maximum before the market resolves.