**Latest numerical weather models and observational data from stations near Jeddah King Abdul Aziz International Airport support a daily maximum of 37°C on September 25, 2026.** Clear to mostly sunny skies, northwest winds of 5–9 m/s, and typical late-September humidity levels around 50–70% allow strong solar heating without significant cooling from clouds or precipitation. This aligns with the climatological average high for the period and recent model runs showing afternoon peaks near 36–38°C under stable high-pressure influence. Traders have converged on the 37°C outcome as the implied probability because minor forecast adjustments have remained within this narrow band, with no major model divergence or unexpected atmospheric shifts reported in the past 24–48 hours. The market could shift only if final hourly readings reveal a notably higher or lower peak due to localized factors like wind gusts or brief cloud cover.