Strong market consensus at 22°C reflects the latest Met Office observational data and forecast model runs showing London locked in a stable warm air mass during the ongoing heatwave, with urban heat island effects and light winds limiting overnight radiative cooling to produce a minimum near that threshold. High daytime maxima near 34°C have transitioned into mild evening conditions without significant frontal passages or cloud cover changes that would accelerate temperature drops. Official guidance from the Met Office indicates minimal variability in the final hours, aligning trader sentiment with verified measurements over model projections. A rapid influx of cooler maritime air or unforecast thundery activity could still shift the recorded low, though current atmospheric patterns make such developments unlikely before resolution.