**Forecast consensus from official meteorological sources positions a daily high of 36°C as the most probable outcome for Jeddah on September 27, 2026, with 37°C and 35°C as close alternatives.** Late-September conditions feature persistent high pressure, predominantly clear skies, and light to moderate westerly winds off the Red Sea that moderate peak temperatures while maintaining high humidity. Current model runs and agency guidance (including NCM baselines) indicate afternoon maxima near the long-term September average of 35–37°C, with no significant tropical moisture, dust events, or anomalous steering patterns expected to drive deviations. Morning observations around 30–32°C and steady diurnal heating support the tight clustering of market-implied probabilities around these three values, while lower or higher extremes remain unlikely absent rapid forecast shifts. Updated NHC/NOAA-equivalent regional guidance and next model cycle will provide the final confirmation before resolution.