Trader consensus on Seattle's March 26 high temperature clusters tightly around 50-55°F, reflecting ensemble model outputs from NOAA and ECMWF that pencil in peaks near 52°F under a persistent cool marine layer from the Pacific. Late March climatology typically sees highs averaging 54-56°F, but a deep upper-level trough over the Northwest suppresses ridging, favoring cloudy skies and northerly winds that enhance boundary-layer stability and limit diurnal heating. Key differentiators include afternoon stratus clearing—potentially nudging toward 54-55°F (21.5% odds)—versus prolonged overcast conditions anchoring 50-51°F (26%), with model spread capturing this 4-5°F uncertainty amid recent cool anomalies. Official NWS point forecasts align with these midpack bins, underscoring low risk of extremes.