**Stable high-pressure conditions and typical late-summer diurnal patterns over the Red Sea coast are keeping trader focus on the narrow range of expected overnight lows for Jeddah on September 18.** Recent model runs from sources such as the Met Office, ECMWF, and GFS show nighttime minima clustered around 28–30 °C under mostly clear skies and light variable winds, with dew points near 25 °C sustaining high humidity. This setup produces only modest radiative cooling after sunset, limiting the chance of dropping to 25 °C or below while also capping upside risk above 31–32 °C. Historical September climatology for Jeddah reinforces these values, with recent observed minima between 28–31 °C. Near-even market pricing between the sub-26 °C and mid-30s °C brackets reflects residual uncertainty in exact timing of the daily minimum and minor model spread in boundary-layer mixing, rather than any active weather catalyst. No significant forecast updates or synoptic changes are anticipated before resolution.