Jeddah's coastal position on the Red Sea produces persistently high overnight minimum temperatures in August, typically averaging around 29–31°C due to limited radiative cooling from elevated humidity (often 50–60%), warm sea surface temperatures near 30–31°C, and light northwest or west-northwest winds that reduce temperature drops. Subtropical high pressure and minimal cloud cover or precipitation further stabilize these values, though slight variations in wind speed, aerosol loading from dust, or urban heat island effects can shift the exact low by a degree or two. Forecasts for August 21, 2026, cluster tightly around 29–31°C lows with above-normal seasonal temperatures expected, creating closely matched market probabilities near 34% for those outcomes; differentiation among 28–33°C hinges on model uncertainty in pre-dawn conditions and precise measurement criteria rather than any dramatic weather shift.