Recent forecasts from multiple models place Seattle’s September 12 low in the mid-50s°F, with trader consensus split between the 54–55°F and 56–57°F bins reflecting lingering uncertainty in overnight radiational cooling. Persistent marine-layer clouds and light onshore flow have limited clear-sky cooling, while light rain chances later in the period may further moderate temperatures near the surface. This pattern aligns with the seasonal retreat of the North Pacific High and strengthening onshore flow typical of early fall in the Pacific Northwest, where average lows for the date sit near 54°F. Updated National Weather Service guidance and any overnight model runs will likely refine the exact minimum before resolution.