**Forecast consensus from major models centers on a daily high near 38–39°C for Jeddah on August 23, aligning with the market’s tight clustering around those outcomes.** Coastal Red Sea moderation and typical summer humidity levels (50–65%) limit extreme spikes, while light northwesterly winds and clear skies support gradual daytime warming to peak in the late afternoon. Seasonal outlooks note slightly above-normal temperatures across western Saudi Arabia this summer, introducing modest upside risk toward 40°C if local steering patterns suppress sea breezes. Historical August maxima average 37–39°C, with rare excursions above 40°C under stagnant high-pressure setups. Traders appear to weigh recent model runs showing 38°C against the potential for a 1°C warmer realization given the above-average baseline, leaving the 39°C outcome with the highest implied probability.