Latest National Weather Service and model consensus for Miami point to an overnight low in the upper 70s to low 80s on August 24, keeping the 78–81°F bins tightly matched at 69% combined implied probability. Persistent high humidity, light winds, and extensive cloud cover from typical late-summer maritime air limit radiational cooling, while sea-surface temperatures near 86°F and a weak pressure gradient further suppress temperature drops. Minor differences between the leading bins hinge on forecast timing of any brief clear spells or slight wind shifts that could allow an extra degree of cooling. No tropical systems or strong fronts are expected to alter the pattern before resolution, so traders are weighting ensemble guidance that shows only modest day-to-day variability around the seasonal normal.