**Forecast models and real-time observations from sources like the Saudi Meteorological Authority and international agencies converge on a daytime peak of 36°C in Jeddah on September 22, 2026.** Clear skies, light westerly winds, and high humidity typical of the Red Sea coastal climate have supported steady warming through midday, aligning with historical September averages of 35–37°C. This strong consensus underpins the market's near-certain 36°C outcome. Minor deviations remain possible from localized sea breezes, urban heat effects, or slight timing shifts in maximum readings, though current atmospheric stability makes significant departures unlikely before resolution.