Recent model runs from sources like ECMWF and GFS indicate a frontal system and scattered thunderstorms arriving over Milan on September 17, 2026, with daytime highs near 23°C but variable overnight cooling that could push the minimum anywhere from the mid-teens to around 19°C. High uncertainty stems from cloud cover suppressing radiative cooling, variable precipitation timing, and steering winds that may advect cooler air or allow partial clearing. This balance between potential modest cooling and lingering warmth underpins the near-even market-implied odds for extremes at 13°C or below versus 23°C or higher, while intermediate bins reflect traders weighing ensemble spread against climatological September lows near 15–16°C. Updated model guidance expected in the next 24–48 hours will likely sharpen resolution criteria around official minimum readings.