Persistent cloud cover, high humidity, and easterly flow across South Florida limited nighttime radiative cooling on September 10, anchoring the official NOAA minimum at Miami International Airport within the 74–75°F range that now commands full market consensus. This outcome aligns with the September climatological average low near 77°F and recent observations showing overnight temperatures rarely dipping below the mid-70s amid scattered showers and warm Gulf/Atlantic moisture. Model guidance from the National Weather Service reinforced expectations of minimal cooling under overcast skies, consistent with historical patterns where clear, dry nights are required for sub-74°F readings. A sudden shift to clear conditions or an unforecast cold surge could have allowed greater heat loss, though neither materialized in the final data.