Current ensemble forecasts for Jeddah on October 17 point to clear skies, light northerly winds, and overnight radiative cooling producing minimum temperatures near 28°C, consistent with recent model runs and the seasonal baseline of 24–27°C lows. Traders assign the highest implied probability (50%) to 24°C or below, reflecting uncertainty in nocturnal boundary-layer mixing and potential for stronger cooling under stable high pressure, while probabilities cluster around 25–31°C outcomes. Historical October records show occasional dips below 25°C, but persistent warm Red Sea moisture and minimal cloud cover this week limit downside risk. Updated high-resolution model guidance expected within 24 hours could shift these market-implied odds.