Current forecast models from sources like the Met Office and ECMWF indicate a transition to cooler, more unsettled conditions over southern England by August 21, driven by increased Atlantic airflow, extensive cloud cover, and light showers that limit daytime heating. This follows a brief warm spell earlier in the month, with ensemble guidance pointing to a maximum around 19–22°C in central London under overcast skies. Historical August averages near 22°C provide context, but the specific synoptic setup favors suppression of peaks below recent highs. These factors underpin the market's concentration of implied probability on 20–22°C outcomes, with limited support for extremes due to the narrow forecast spread and proximity to resolution.