Latest National Weather Service forecasts for San Francisco point to an overnight low near 58°F on October 9, supported by persistent southwest onshore flow, increasing marine-layer influence, and partial cloud cover that limits nighttime radiative cooling. These conditions align with the market's leading 58-59°F bin at 51.5% implied probability while the tight 46.5% on 70°F or higher captures lingering uncertainty over whether the recent warm spell will sustain elevated minima. October climatology shows typical lows around 55°F, so current guidance represents a mild but not extreme outcome; final model runs and evening observations before resolution remain key variables for traders.