**High pressure, intense solar heating, and typical Red Sea coastal patterns position afternoon maxima near 39–41°C as the most probable outcomes for Jeddah on August 13.** Long-range model guidance and climatology show stable subsidence under the subtropical ridge, minimal cloud cover, light northerly winds, and low precipitation chances, all favoring clear-sky heating. Coastal humidity provides slight moderation relative to inland sites, but strong insolation still supports readings at or above the seasonal average of 37–38°C. Recent observations from early August have frequently reached 38–40°C, and official outlooks from Saudi Arabia’s National Center for Meteorology indicate warmer-than-normal conditions persisting through the month. Short-range forecasts currently cluster around 39°C, with some guidance edging toward 41°C or higher under continued dry, sunny conditions. With resolution only two days away and little expected change in the synoptic pattern, trader probabilities concentrate on the upper end of the normal range, reflected in the leading 42% implied probability for 41°C or above.