Current National Weather Service guidance and model consensus indicate Miami's August 20 high will likely fall in the low-to-mid 90s°F amid typical late-summer conditions of high humidity, light winds, and afternoon sea-breeze convergence favoring scattered thunderstorms. These convective developments, whose timing and coverage remain the chief uncertainty, can suppress peak temperatures by limiting insolation or allow readings to edge higher if storms develop later or remain isolated. With 92–93°F and 94–95°F bins trading near parity, markets reflect the narrow forecast spread and sensitivity to the next model runs and official updates from the Miami forecast office. Historical August normals near 89°F provide context, while heat indices above 105°F underscore the role of moisture in realized warmth.