Latest Met Office guidance and ensemble models indicate London will likely see maximum temperatures of 26–27°C on August 17 under sunny intervals and light easterly winds, driving the market’s tight clustering around those outcomes. Mid-August solar insolation remains strong but is moderated by the region’s maritime climate and any variable afternoon cloud build-up, which can suppress peaks by 1–2°C. Light winds favor localized heating while limiting advection of warmer air masses. Historical climatology places typical late-summer highs near 22–24°C, so current stable high-pressure patterns represent above-average but not extreme conditions. Updated model runs tomorrow morning will refine the precise threshold ahead of market resolution.