Trader consensus on Polymarket tilts slightly toward 18°C as Milan's highest temperature on March 25, driven by the latest ECMWF ensemble mean forecasting a peak near 17.5–18.5°C amid a building high-pressure ridge ushering mild southerly flow from the Mediterranean. GFS runs diverge lower at 16–17°C, factoring potential afternoon cloudiness, explaining the razor-thin odds between 17–19°C outcomes. Historical late-March highs in Milan average 13–15°C per ARPA Lombardia data, but this anomalously warm setup—boosted by low Arctic Oscillation—elevates upside risk, with low probabilities for extremes reflecting minimal cold front threats per current synoptic charts. New model updates expected within 24 hours could shift sentiment.