Recent GFS and ECMWF ensemble forecasts have converged on Seattle highs near 55°F for April 13, driving trader consensus toward the 52-57°F range with implied probabilities tightly clustered at 30%, 27%, and 24.5% respectively. This follows a warm spell peaking at 70°F on April 6—the season's first—now yielding to a cooler upper trough over the weekend, ushering in marine-influenced onshore flow and potential stratus clouds that cap temperatures. Differentiating factors include model disagreements on trough departure timing and boundary layer mixing, which could swing peaks 3-5°F via varying cloud cover or diurnal heating. National Weather Service discussions note mid-50s under a weak rebuilding ridge, aligning with climatological April norms around 58-60°F amid NOAA's 40-50% above-normal spring outlook. Overnight model updates may sharpen guidance ahead of resolution.