**Trader sentiment for Miami's lowest temperature on August 13 centers on the narrow gap between 78–79°F and 80–81°F bins, reflecting typical late-summer subtropical conditions with modest forecast variability.** Miami's climate features high humidity and limited nighttime radiational cooling under the influence of the Bermuda-Azores high, keeping overnight lows near the long-term August average of roughly 78–80°F. Recent National Weather Service observations show minimums of 81–84°F in early August amid a heat advisory and mostly clear to partly cloudy skies, with easterly flow and dew points in the mid-70s suppressing further drops. Forecast models indicate partly cloudy conditions and possible stray showers or thunderstorms on the 13th, which could modestly enhance or limit cooling depending on timing and coverage. The close probabilities between the two leading outcomes capture uncertainty in exact wind speeds, cloud thickness, and boundary-layer moisture that determine whether the minimum settles in the upper 70s or low 80s. Stronger consensus around these bins aligns with climatology and the absence of major tropical systems altering the pattern in the short term.