Current ensemble forecasts from NOAA and other models indicate Miami's July 21 overnight low will likely settle in the 78–83°F range, driven by persistently high dew points near 75°F, light southerly flow, and limited nocturnal radiative cooling under humid subtropical conditions. Long-term trends show elevated minimum temperatures in South Florida, with recent July averages 2–4°F above historical normals around 77–78°F. Trader positioning reflects model spread on convective timing and any localized showers that could enhance cooling versus persistent cloud cover trapping heat, creating tight probabilities across mid-70s to mid-80s outcomes. Updated NWS guidance and next model runs will clarify resolution thresholds.