Official National Weather Service forecasts for Miami on October 4 project a high near 88°F under mostly sunny conditions with southeast winds of 10-15 mph and low precipitation chances. This drives the near-even market split between 88-89°F (51.5%) and 90-91°F (45%), as small differences in afternoon insolation, sea-breeze timing, or model consensus on boundary-layer mixing can shift the peak by 1-2°F. Current warm, humid air mass supports temperatures several degrees above the October climatological average of 83-85°F at Miami International Airport, though forecasters note typical uncertainty ranges in maximum temperature predictions. No significant model shifts have occurred in the past 24 hours, with the next key updates expected from morning soundings and updated NWS guidance.