**Persistent high heat and humidity in Jeddah are keeping overnight lows elevated, with forecasts pointing to minimum temperatures near or above 30°C on August 24.** Coastal Red Sea location, combined with light northerly winds, high dew points (often 20–25°C), and partly cloudy skies, limits radiative cooling and supports tropical overnight readings well above the long-term August average low of ~27°C. Recent station data through late August show observed minima frequently in the 28–32°C range, consistent with the current heatwave pattern and urban heat retention. Multiple forecast models (including ECMWF, GFS variants, and local guidance) converge on a 29–32°C minimum for the 24th under stable high-pressure conditions and negligible precipitation. This scientific setup—minimal diurnal temperature range driven by moisture and suppressed winds—explains why the market assigns the highest implied probability (42.5%) to 33°C or higher, while outcomes below 28°C remain at low single-digit odds. Updated model runs and official monitoring in the next 24 hours will refine the exact threshold ahead of market resolution.