Official forecasts from the National Weather Service and AccuWeather point to a daily maximum near 92–93°F at Miami International Airport on August 21, driven by typical late-summer subtropical conditions with light easterly flow, high humidity, and afternoon sea-breeze convection that often limits peak heating. Recent model runs show only modest variability, keeping 94–95°F as a plausible but less likely outcome if skies remain clearer longer. August climatology places average highs around 89°F, so the current consensus reflects slightly above-normal warmth without extreme heat indices or blocking patterns that would push readings higher. Updated NHC and local guidance through the evening of August 20 will refine thunderstorm timing, the main variable that could trim or sustain the high.