Forecast models from agencies like the Met Office and BBC currently project Jeddah's August 14 daytime maximum between 39–41 °C, aligning with National Center for Meteorology guidance for above-normal warmth through October. This narrow spread drives the closely matched market probabilities around 39 °C, 40 °C, and 41 °C or higher. Key differentiating factors include ensemble variations in Red Sea maritime moisture, which elevates humidity and apparent temperature, versus northwesterly wind speeds that enhance mixing and evaporative cooling. Clear skies and peak August solar loading favor the upper end, but minor shifts in subsidence or cloud timing could cap the reading near 39 °C. Updated model runs and official observations on the 13th–14th will refine the outcome.