Trader consensus strongly favors an 88-89°F high in Miami on September 20 due to official National Weather Service observations and model guidance showing typical late-September conditions dominated by afternoon thunderstorms and high humidity. These factors promote convective cloud cover that limits peak solar heating near the 88.9°F climatological average, with surface observations confirming a maximum of 90°F amid scattered showers. NOAA data and historical analogs indicate such patterns reliably cap daily highs in this range during the peak of the Atlantic hurricane season. A clear-sky regime or stronger high-pressure ridge suppressing convection could have allowed readings into the low 90s, though ensemble forecasts showed low probability of those conditions materializing by the observation window.