The market's near-certain consensus on a 76-77°F low for Miami on September 17 stems from official National Weather Service observations confirming that minimum temperature at Miami International Airport. Persistent high pressure, light easterly winds, and dew points in the low 70s suppressed nocturnal cooling while preventing any late-day surge, aligning closely with September climatology where overnight lows typically range 74-79°F. Model runs from the National Hurricane Center and local offices showed minimal deviation in the 48-hour forecast window, with no cold fronts or tropical moisture intrusions to alter the outcome. Only an unforecasted microscale event, such as an anomalous thunderstorm cell or instrumentation error, could have shifted the reading outside this narrow band.