The September 2026 FOMC meeting's hawkish shift—raising the federal funds rate to the 3.75-4.00% range while lifting the median dot-plot projection to 4.1% for both end-2026 and end-2027—stands as the primary driver of dispersed trader sentiment. Upward revisions to growth and core PCE inflation forecasts, alongside a resilient labor market, have anchored expectations for rates to remain elevated rather than ease materially by late 2027. Polymarket's closely matched probabilities, peaking at 16.5% for 4.75% with substantial weight across 4.0-5.0%, reflect uncertainty over inflation persistence versus potential later cuts, consistent with the spread in official versus private forecasts and ongoing data dependence ahead of future SEP releases.