Forecast models for Jeddah on August 23 cluster around a daytime maximum of 38–40 °C under mostly sunny skies, light northwesterly winds, and negligible precipitation, aligning with Red Sea coastal climatology where August highs typically average near 38–39 °C. This tight range around the 40 °C threshold underpins the market-implied odds of 97 % for exactly 40 °C, as traders assess the balance between typical summer heat and minor uncertainties in local boundary-layer mixing or station measurement timing. Official observations from sources such as the Saudi Meteorological Authority or nearby airport stations will determine resolution, with any late-day cooling or slight model deviation potentially shifting the recorded peak into the 41 °C or higher bucket.