**Official meteorological observations from Jeddah King Abdulaziz International Airport established a daily maximum of 37°C on September 25, 2026, driving the market's near-certain 100% implied probability for that exact outcome.** Real-time station data, including afternoon readings around 36.5°C under clear skies, typical late-September humidity near 50-60%, and light northwest winds, aligned precisely with this threshold. Historical September averages near 33-35°C and the absence of unusual heat anomalies or measurement revisions reinforced trader consensus. With resolution tied to verified agency records, only discrepancies in station selection or post-hoc data corrections could alter the result, though none have emerged.