**Ensemble forecasts from global numerical weather prediction models currently favor peak temperatures of 38–39°C for Jeddah on August 27, consistent with late-summer climatology along the Red Sea coast.** High solar insolation under mostly clear skies, combined with typical August humidity levels of 50–65%, supports this range, while variable sea breezes from the Red Sea can moderate extremes by a degree or two on some days. Historical observations place the mean daily maximum near 38–39°C, with occasional excursions above 40°C when southeasterly flow from the interior dominates. The closely matched market-implied odds reflect genuine uncertainty in short-range model guidance two days out, particularly regarding exact timing of any wind shifts or cloud increases. Updated runs from agencies such as the Saudi Meteorological Authority or ECMWF are expected before resolution and will refine the probability distribution.