**Forecast models from the Met Office and other ensembles place the likely maximum temperature in London on August 16, 2026, in a narrow band around the mid-20s Celsius, producing closely matched market-implied odds for 25–27°C.** Official guidance shows daytime highs of 26–27°C under high pressure with sunny spells and light winds, following the recent heatwave peak. Slight differences arise from variations in cloud cover timing, urban heat-island effects across measurement sites, and minor model discrepancies in boundary-layer mixing. Ensemble spreads remain modest two days out, keeping the three leading outcomes nearly equal while lower probabilities attach to cooler or warmer outliers. Updated model runs and official briefings over the next 24–48 hours will likely tighten the range.