Jeddah’s coastal desert setting typically produces August daily highs centered on 37–39°C, driven by intense solar insolation, light winds, and minimal cloud cover, with the Red Sea moderating extremes relative to inland sites. Current forecasts for August 25, 2026, from multiple sources cluster around 36–37°C under mostly clear to partly cloudy conditions, aligning with the month’s long-term average high near 37°C. The market’s concentration on 38°C (37% implied) followed by 39°C (26%) reflects trader weighting of slight upside potential from variable onshore flow or reduced marine influence, while the 14% on 40°C or higher and 18.5% on 37°C capture residual uncertainty in model guidance and short-term steering patterns. No major synoptic shifts or heatwave signals have emerged in the latest runs, keeping probabilities anchored to climatological norms with modest day-to-day variability.