Recent National Weather Service and model guidance indicate San Francisco minimum temperatures on October 5 will likely fall in the upper 50s to low 60s °F under persistent upper-level ridging, clear skies, and light onshore flow that limits marine-layer cooling. This setup follows an extended heat wave with above-normal daytime highs and reduced nocturnal radiative cooling, pushing overnight lows several degrees above the 55 °F climatological average. Trader consensus reflected in the closely matched mid-range probabilities (around 34 %) versus the elevated 74 °F+ share captures uncertainty in exact timing of any weak sea breeze or localized fog development, while the low 4.6 % on 55 °F or below aligns with the strong consensus against significant cooling. Updated NWS forecasts and next model runs will refine the precise minimum ahead of market resolution.