Recent National Weather Service and ensemble model guidance points to a minimum temperature in the mid-to-upper 60s for Los Angeles on September 20, driven by persistent marine-layer stratus and fog that limit nocturnal radiative cooling under light onshore flow. This setup typically holds overnight lows several degrees above the long-term average of 63°F by trapping heat and suppressing clear-sky temperature drops. Subtle differences between the 66–67°F and 68–69°F bins hinge on the precise timing of any partial clearing, boundary-layer wind speeds, and dew-point depression—factors that current model runs show only modest spread around. With no strong offshore wind event or unusual thermal trough expected, trader consensus aligns closely with these stable, above-normal conditions rather than cooler or warmer outliers.