Recent Met Office guidance and ensemble model runs indicate a peak of around 26°C in London on August 26, supported by mild southerly flow and limited cloud cover, though incoming low pressure from the southwest introduces uncertainty through variable showers and reduced insolation that could cap highs at 25°C. ECMWF and GFS outputs show tight clustering in the mid-20s Celsius range, with historical August maxima near 21–23°C providing context for the modest anomaly. Trader consensus across the closely matched 25–27°C outcomes reflects this narrow forecast spread and typical model divergence on exact timing of frontal passages two days ahead, alongside London's urban heat-island effect that can add 1–2°C locally at official stations. Updated short-range guidance expected from the Met Office will likely refine these probabilities.