Forecast consensus from NWS and multiple models points to a Miami overnight low near 76–78 °F on September 30, driven by persistent easterly flow, high humidity, and widespread cloud cover from scattered showers and thunderstorms. These conditions limit radiational cooling overnight while daytime heating remains modest under overcast skies, keeping the diurnal range narrow. Historical late-September climatology shows typical lows near 76 °F, with recent model runs showing little deviation absent a stronger frontal passage. Trader-implied probabilities cluster tightly around the 74–79 °F bins because small forecast shifts in timing or intensity of convection could easily move the observed minimum by 1–2 °F, while extremes below 70 °F or above 82 °F remain improbable without unexpected synoptic changes.