**Current forecasts from the UK Met Office and other models indicate an overnight low around 20–21°C for London on August 14, aligning with the market's leading implied probabilities clustered at 21–22°C (combined ~68%).** A lingering heatwave—part of what is shaping up as the UK's hottest summer on record—has kept daytime highs near or above 33–35°C recently, with warm advection and limited nocturnal radiative cooling under partly cloudy or clear conditions preventing sharper drops. Model consensus shows a slight moderation on the 14th as high pressure eases, yet residual warmth from the preceding days and urban heat-island effects support minimums in the low 20s Celsius rather than typical mid-August averages near 14–16°C. Traders appear to weigh these near-term dynamical factors and short-range ensemble guidance heavily, assigning low odds to outliers below 19°C or above 24°C that would require unexpected frontal passages or rapid clear-sky cooling not supported by current observations. Updated model runs and Met Office briefings over the next 24 hours remain the key variables that could shift these probabilities.