**Met Office forecasts and supporting numerical weather prediction models position 24°C as the expected maximum temperature for London on September 25, 2026, aligning with the market’s 96.5% implied probability.** Sunny intervals after early low cloud, light northwest winds, and negligible precipitation risk support daytime warming to this level under stable high-pressure influence. Ensemble guidance shows tight clustering around 23–25°C, with limited spread reflecting modest uncertainty in boundary-layer mixing and insolation. Real-time observations from central London stations will determine the precise peak; modest deviations remain possible if afternoon cloud cover thickens more than anticipated or if localized heating exceeds model expectations, though current conditions make substantial departures unlikely.