Forecast models from sources including ECMWF, GFS, and local observations indicate a typical late-summer pattern for Jeddah on September 21, with clear skies, light westerly winds, and high solar insolation supporting daytime maxima near 36–37°C. Recent days have seen similar readings around 35–37°C under stable high pressure, consistent with September climatology of 35–36°C averages and rare excursions above 39°C. Trader consensus clusters on 36–38°C because small differences in peak heating—driven by minor variations in afternoon wind speed, boundary-layer mixing, or exact cloud timing—can shift the daily maximum by 1–2°C across ensemble members. With no approaching fronts or moisture surges, the market reflects genuine uncertainty in resolving the precise peak rather than divergent large-scale drivers.