Recent National Weather Service and model guidance indicate overnight lows in Miami will likely hold near 80°F on August 20 amid a warm, humid airmass with dew points in the mid-70s and light southerly flow limiting radiative cooling. Persistent moisture and a modest chance of overnight showers or clouds further suppress temperature drops below the typical August climatological low of 78°F. Trader consensus, reflected in closely matched 33% and 27% implied probabilities for the 80–81°F and 78–79°F bins, centers on these variables plus minor steering influences from the Bermuda high. Updated short-range model runs tomorrow morning represent the next key data point that could shift resolution odds.