**High pressure and southerly flow are driving London's peak temperatures into the mid-30s Celsius today.** An established anticyclone over northwest Europe has produced clear skies, light easterly winds, and strong insolation across southeast England, with Met Office guidance forecasting a London maximum of 35 °C under an Amber Extreme Heat warning. Ensemble runs and neighboring stations cluster tightly around 34–36 °C, reflecting modest uncertainty from possible afternoon high cloud or slight variations in boundary-layer mixing. The market’s heaviest weighting on 35 °C (50 %) followed by 34 °C (23 %) and 36 °C (21.5 %) directly mirrors this consensus: official point forecasts sit at 35 °C, while historical heatwave analogs and model spread allow a realistic chance of one degree either side. Later-day observations or any unexpected convective development could still shift the final recorded maximum, but current surface conditions and short-range guidance keep the probability mass firmly centered on the 34–36 °C band.