**Recent forecasts from the Met Office and other models indicate a maximum temperature of around 22°C for London on August 29, 2026, with widespread cloud cover, showers or rain, and southwesterly winds expected to limit daytime heating.** These conditions align with the market-implied probabilities favoring 20–21°C (combined ~76.5%), as persistent low-level cloud and precipitation reduce solar insolation and suppress the diurnal temperature rise typical for late summer. Scientific drivers include an unsettled Atlantic flow bringing mild but moist air masses, with forecast soundings showing limited instability and boundary-layer mixing capped by stratiform clouds. Historical climatology for late August in London shows mean daily maxima near 20–22°C, and current model consensus (Met Office, ECMWF guidance reflected in public outputs) shows no strong ridging or clear-sky subsidence that would push readings to 23°C or higher. The low odds on 22°C+ reflect this consensus, while probabilities cluster around 20–21°C because showers are timed to coincide with peak heating hours, preventing full realization of the 22°C guidance in many ensemble members. Traders are weighting the latest model runs showing rain probabilities exceeding 50–70% midday onward, which introduces downward bias relative to clear-sky potential. Upcoming updates from the Met Office and high-resolution models will likely refine the exact peak once radar and satellite trends confirm cloud thickness and shower timing.