NCM seasonal outlooks indicate a 55–80% probability of above-normal surface temperatures across Saudi Arabia through August 2026, with anomalies up to 2°C above the long-term August mean of roughly 36–38°C in Jeddah. Short-range numerical guidance for August 5 shows mostly clear skies, light northwesterly flow, and peak solar insolation supporting daily maxima near 37–39°C, though Red Sea coastal moderation and high boundary-layer humidity introduce model spread around exact peak values. Minor differences in forecast mixing depth, wind timing, and localized urban heat effects explain the tight clustering of market-implied odds between 37°C and 39°C, with traders assigning meaningful probability to 40°C or higher only if models trend warmer in the final updates before resolution.