Persistent subtropical high pressure over the Arabian Peninsula and warm Red Sea surface temperatures near 30–32°C sustain extreme heat and humidity across Jeddah, driving mid-August daily maxima that climatologically average 38–43°C. Recent forecasts from the Met Office and BBC Weather project highs of 38–41°C for August 18 with minimal cloud cover and light northwesterly winds, aligning with the market's leading 40°C-or-higher (45%) and 39°C (31%) outcomes while limiting downside risk to lower bins. No significant cooling fronts or monsoon influences are expected in the next 48 hours, keeping implied probabilities anchored to these typical peak-summer conditions until updated model runs refine the exact peak.