**Forecasts from the National Weather Service and other models indicate Miami's overnight low on September 19 will likely fall in the mid to upper 70s°F amid typical late-summer conditions of scattered thunderstorms, easterly flow, and high humidity.** Recent model runs show consistency with no major synoptic changes, such as frontal passages or tropical influences, keeping temperatures aligned with seasonal baselines where Miami minima average near 77°F in mid-September. Slight differences in predicted cloud cover, wind speeds, and precipitation timing create uncertainty in the exact minimum, as these factors modulate nocturnal radiative cooling. Trader sentiment reflects this narrow forecast spread, with the closest bins (74–77°F) capturing most implied probability while lower or higher outcomes remain possible if steering patterns or local effects shift. Updated NWS guidance and model ensembles ahead of the date will likely refine these odds.