**Recent numerical weather prediction consensus from models including ECMWF points to a daily maximum near 37°C in Jeddah on September 26 under clear skies and moderate northwesterly flow.** Coastal Red Sea location and typical late-September climatology—average highs around 36°C—support this range, with daytime heating peaking midday to afternoon before winds strengthen. Current observations show stable high pressure, low humidity aloft, and no significant moisture or dust advection that would suppress or enhance temperatures. Minor model spread between 35–39°C creates the tightest market clustering at 36–38°C, as traders weigh localized sea-breeze effects and observational timing at King Abdulaziz International Airport against the strong baseline signal. Updated guidance on the 25th has kept implied probabilities anchored in this narrow band ahead of the official daily maximum report.