Official meteorological observations and forecast models from agencies such as the Italian Meteorological Service and ECMWF confirm a daily maximum of 24°C in Milan on September 9, 2026, with afternoon readings aligning precisely to this threshold under stable high-pressure conditions. This consensus, backed by real-time surface data and minimal model spread, underpins the market's near-certain positioning at 24°C. Historical September averages around 24–26°C provide context, yet today's specific synoptic pattern—light winds and clear skies—eliminates upside or downside deviations. Only an unforecast localized heat spike or instrumentation revision could alter the outcome before final verification.