Latest Met Office guidance and supporting ensemble models indicate a daytime maximum near 25°C for London on August 25, supported by sunny intervals under a weakening high-pressure regime, with hourly peaks projected in the early afternoon. This places the market-implied probabilities for 22–24°C at the center of trader focus, reflecting typical model spread arising from small differences in cloud cover, boundary-layer mixing, and light southerly advection that can shift the peak by 1–2°C. Historical August climatology for the region shows mean maxima of 21–23°C, so current above-average guidance narrows the distribution while residual uncertainty in precipitation timing keeps lower and higher bins active. Updated model runs and the next Met Office briefing remain the key near-term catalysts before resolution at the official London station.