Latest numerical weather prediction models from global ensembles indicate daytime maxima in Jeddah on August 6 will center near 39–41 °C, driving the market’s emphasis on the 40 °C and 41 °C outcomes. Jeddah’s Red Sea coastal location produces persistently high humidity that limits nighttime cooling, while regional subsidence and light winds favor peak afternoon readings. Official National Center of Meteorology guidance for August 2026 notes above-normal temperatures across western Saudi Arabia, consistent with observed early-month values near 39 °C. Model spread remains modest but allows for local urban-heat or slight steering variations that could shift the recorded high by 1 °C, explaining the graduated probabilities across the 38–42 °C range. Final resolution will rely on verified station observations released shortly after the calendar day ends.