Recent National Weather Service and model guidance point to overnight lows in the low 70s for Miami on September 27, driven by northerly winds advecting slightly drier continental air and reduced cloud cover that enhances radiational cooling after sunset. With dew points holding near 70–74 °F, the urban heat island and light easterly flow after midnight will limit how far temperatures drop, while any increase in low-level moisture or lingering clouds could keep the minimum closer to 74–75 °F. Traders appear to weigh these variables heavily, as historical September 27 lows average around 76 °F but current steering patterns and short-range ensemble spread favor the 70–73 °F range. Updated model runs and evening observations will refine the exact threshold before resolution.