Current forecast consensus from models including GFS points to an overnight low near 49–52°F for Seattle on October 1, shaped by clearing skies after recent rain and moderate northerly winds that limit marine-layer moderation. Radiative cooling under partly cloudy conditions and light winds will determine how far temperatures drop before dawn, while any lingering fog or thicker cloud decks could raise the minimum by several degrees. Historical early-October lows average around 49°F, providing a baseline, yet short-term variability in boundary-layer moisture and high-pressure building offshore creates the tight clustering of market-implied probabilities across the 48–57°F range. Updated National Weather Service model runs and local observations over the next 48 hours will refine the exact threshold before resolution.