Recent forecast updates from multiple models place Jeddah’s September 16 maximum near the long-term September average of 37–38 °C, with current runs showing peaks of 37–38 °C under mostly sunny skies, light southwesterly winds, and humidity of 50–70 %. The tight 34 %–30.5 % split between 38 °C and 37 °C in the market reflects modest differences in model guidance on peak insolation, afternoon cloud cover, and Red Sea moisture advection that can suppress or enhance surface heating by 1 °C. Historical data indicate daily highs in this range occur frequently in mid-September, while the low probabilities assigned to 39 °C or higher align with the absence of strong high-pressure ridging or reduced wind flow that would be needed for greater warming. Updated model runs and official observations tomorrow evening will determine the final recorded maximum.