Jeddah’s coastal Red Sea location and urban heat island effects typically produce August daily maxima averaging near 38–39 °C, with natural day-to-day variability driven by sea-surface temperatures, humidity, and regional high-pressure patterns. Recent decades show a clear warming trend exceeding 2 °C since the late 1970s, elevating the chance of 40–41 °C readings while keeping 42 °C or higher less common absent an anomalous heatwave. Current short-range model guidance and climatological analogs support trader consensus around these central values, with implied probabilities reflecting both historical baselines and the modest upward shift in extremes observed in recent warm spells. Updated forecasts in the next 24 hours could refine the exact peak before resolution.