**Current forecast models indicate the overnight low in Jeddah on September 4 will most likely fall in the 29–31°C range, driven by persistent high pressure, clear skies, and light northwest winds typical of early September along the Red Sea coast.** This aligns with climatological norms showing average September lows near 27–29°C, moderated by high humidity (often 50–70%) from the warm Red Sea waters that limit radiative cooling. Recent model runs from sources like PredictWind, Met Office, and Yr.no consistently project minimums around 29–31°C under stable conditions with minimal cloud cover and no significant synoptic disturbances expected in the next 48 hours. The closely matched market odds reflect genuine uncertainty in precise overnight cooling rates, where small shifts in humidity, wind speed, or boundary-layer mixing could push the low a degree or two in either direction. Key variables include the strength of the land breeze and any subtle changes in Red Sea sea-surface temperatures, which influence moisture advection. New model updates and local observations over the coming day will likely refine these probabilities ahead of resolution.