Recent National Weather Service and ensemble model guidance indicate the lowest temperature in Seattle on October 5 will most likely fall in the low to mid-50s Fahrenheit, driven by persistent high pressure, light winds, and clear to partly cloudy skies that limit radiational cooling while maintaining mild maritime air. Overnight lows near 52–53°F align with current point forecasts and exceed the 1991–2020 average low of 49°F for the date. Trader emphasis on the 64°F-or-higher bin and multiple mid-50s ranges reflects confidence in this stable pattern, with only a 4% market-implied chance of 45°F or below given the absence of incoming cold air or significant cloud cover that could alter the minimum. Updated model runs and local observations over the next 48 hours will provide the final inputs before resolution.