Forecast models from sources including Meteogiornale, Met Office, and others converge on a September 22 high near 25°C in Milan, with some runs reaching 27°C under mostly clear to partly cloudy skies and light easterly flow. This range reflects modest daytime radiative heating under high pressure, limited by seasonal cooling and moderate humidity that curbs extreme warming. Traders assign nearly equal implied probabilities across 24–28°C because small differences in cloud timing, wind speed, or boundary-layer mixing can shift the peak by 1–2°C. Historical September averages near 23°C provide context, while recent model updates show stable conditions without strong advection of warmer air. Resolution hinges on the official daily maximum recorded by local meteorological stations.