Current ensemble forecasts from the ECMWF and Met Office models indicate overnight lows near 18–19°C for London on July 30, driven by the continuation of above-average minimum temperatures observed throughout summer 2026, with UK nighttime averages running 1.5°C above the long-term norm. Persistent high pressure has limited cloud cover and reduced radiative cooling, while southerly flow has advected milder maritime air, keeping urban heat-island effects pronounced in central London. These conditions differentiate the closely matched 19°C (44.5%) and 18°C (39%) outcomes, as even modest increases in low-level moisture or slight shifts in wind direction could drop readings by 1°C. Updated short-range model runs and official Met Office briefings expected over the next 48 hours will refine the final distribution.