Forecast consensus from National Weather Service and meteorological models points to a daily minimum temperature in Miami on September 29 in the mid-70s, driven by persistent cloud cover, scattered thunderstorms, and high humidity that limit overnight radiative cooling under typical late-September subtropical conditions. These factors differentiate closely matched market outcomes around 74–77°F, as variable cloud thickness and light southerly winds can shift the exact low by a degree or two while steering patterns keep cold-air intrusions absent. Historical September averages near 76°F provide context, but current moisture and instability add modest downside risk without supporting extremes below 70°F or above 80°F. Traders will monitor updated model runs and NWS briefings for any revisions ahead of the overnight period.