Recent forecasts from models such as GFS indicate a high of 24–26°C in Paris on September 28 under overcast skies with light northerly winds and possible scattered showers, aligning with the market's heaviest trading on those thresholds. Persistent cloud cover and moderate Atlantic airflow are suppressing daytime heating compared to clearer late-summer conditions, while surface pressure near 1019 hPa and dew points in the mid-teens Celsius further limit peak temperatures. This setup places outcomes above the long-term September 28 average high near 20°C yet well below historical extremes above 28°C. Updated model runs through September 27 show little shift in the expected maximum, keeping trader focus on the narrow 24–26°C band ahead of final observational confirmation.