Forecast consensus from National Weather Service and private models places Miami’s overnight low for August 27 in the upper 70s to low 80s °F, with most guidance clustering near 79–81 °F amid a typical late-summer tropical air mass. High dew points near 77–80 °F and light east-southeast winds limit radiative cooling, while scattered thunderstorms and variable cloud cover introduce modest uncertainty in the precise minimum. Historical August normals hover around 77–78 °F, but current conditions reflect warmer baseline moisture typical of recent years. The near-even market split between 78–79 °F and 80–81 °F reflects these small forecast differences in timing of any clearing or rain, with traders weighting official NWS point forecasts and ensemble spread that could shift with the next model runs.