**Forecasts for Jeddah on August 29 show overnight lows clustered around 28–32 °C, aligning with the closely matched market probabilities (31 °C at 28 %, 30 °C at 26.5 %, 29 °C at 26 %, 32 °C at 25.5 %).** Multiple models indicate a minimum near 29–31 °C, consistent with recent August observations where nightly drops have been limited. Key drivers include persistently high Red Sea sea-surface temperatures near 33 °C, which sustain elevated dew points (often 24–27 °C) and produce a small dew-point depression that restricts nocturnal radiative cooling. Light northwest winds (generally 1–5 m/s) provide minimal turbulent mixing, while mostly clear skies allow some heat loss but are offset by high humidity trapping longwave radiation near the surface. These conditions typify late-summer maritime influence along the Jeddah coast, where historical August minima average ~27–29 °C but have recently trended higher amid stable subtropical high pressure and absent synoptic disturbances. Model differences arise mainly from subtle variations in predicted wind speed and timing of any thin cloud patches, which can alter the exact rate of temperature fall between midnight and dawn. With no major weather systems expected and stable pressure around 1004–1006 hPa, the outcome hinges on precise nocturnal boundary-layer processes rather than larger-scale changes.