**Miami's subtropical maritime climate produces consistently warm overnight lows in early August, driven by high atmospheric moisture, minimal radiative cooling at night, and the urban heat island effect around the city.** Official National Weather Service guidance and long-range outlooks show typical minimum temperatures in the 77–82 °F range, with recent model runs and climatological averages centering near 78–80 °F. Persistent onshore flow and scattered thunderstorm activity limit extreme cooling while preventing unusually warm nights, keeping the distribution tightly clustered. The market's heavy weighting on 78–83 °F outcomes directly tracks this forecast consensus and the low historical variance for the date, with only modest probability assigned to deviations that would require atypical steering patterns or stronger nocturnal mixing. Updated National Weather Service point forecasts and ensemble guidance for the coming night remain the key near-term inputs likely to refine these implied probabilities.