Recent atmospheric models indicate a stable high-pressure ridge over the Po Valley will limit daytime heating in Milan on May 18, keeping afternoon maxima near the 20–21°C range favored by traders. Spring climatology shows typical highs of 19–22°C this time of year, with variability driven by boundary-layer mixing, residual cloud cover, and light southerly flow that can either enhance or suppress surface warming by 1–2°C. Ensemble guidance shows tight clustering around these values, with low probability of stronger advection from the Mediterranean or overnight clearing that would push readings into the low 20s. Updated short-range runs from European centers over the next 24 hours will refine the exact peak and determine whether the market’s narrow spread between 20°C and 21°C tightens further.