Recent forecasts from multiple models indicate stable clear skies and light westerly winds over Jeddah on September 30, supporting a daily maximum near 35–36°C under the influence of a subtropical high-pressure ridge. The Red Sea’s moderating effect and elevated humidity levels around 50–60% during peak heating hours limit further warming, keeping values close to or slightly below the September climatological average of 37.6°C. Minor differences in afternoon wind speed or cloud cover could shift the peak by 1°C, creating the tight market split between 35°C and 36°C outcomes. Official readings from King Abdulaziz International Airport will determine resolution, with the final hours of data likely to refine trader consensus before settlement.