Current forecasts from multiple models indicate peak temperatures in Jeddah on September 15 likely between 37–41°C, with afternoon maxima driven by strong solar heating under mostly clear skies, light southwesterly winds, and high humidity from the adjacent Red Sea moderating extremes. Model spreads arise from subtle differences in predicted cloud cover, boundary-layer mixing, and exact wind shifts that can enhance or suppress the daytime temperature peak by 1–2°C. Historical September averages near 35–37°C provide context, while recent stable high-pressure patterns and minimal precipitation support the market's tight clustering around 39–41°C outcomes. Updated model runs and local observations in the next 48 hours will refine these probabilities.