Trader sentiment for Jeddah’s September 11 minimum temperature remains tightly balanced because historical September lows average near 29°C, placing the outcome near the middle of the listed bins while forecast models show modest divergence in overnight cooling. The Red Sea’s sea surface temperatures around 31°C sustain high humidity that reduces radiative heat loss, while variable northerly winds and potential increases in cloud cover—common in September—can either enhance or suppress the diurnal drop. Recent regional patterns indicate stable high pressure with minimal synoptic forcing, keeping most guidance clustered between 28–31°C, yet small shifts in model consensus on boundary-layer moisture or wind speed could tip probabilities toward the 25°C-or-below or 35°C-and-above tails. Updated National Center for Meteorology guidance and the next model runs will likely drive the next market movement.