Current ensemble forecasts from the Met Office and ECMWF place London's July 21 overnight minimum near 13–15°C, with model spreads reflecting modest uncertainty in cloud cover, wind patterns, and any lingering frontal systems that could nudge readings slightly lower or higher. This tight clustering of trader-implied probabilities around those thresholds captures the typical mid-summer baseline for the city, where radiative cooling under clear skies competes with urban heat retention and Atlantic air masses. Upcoming model runs and updated observations over the next 48 hours remain the key near-term catalysts likely to sharpen or shift the distribution before the market resolves.