Traders have converged on 38°C as the near-certain outcome for Jeddah’s highest temperature on August 16 because official forecasts and climatological data align precisely with this value. Mid-August marks peak summer in Jeddah’s hot desert climate, where long-term averages show daily maxima of 38°C under stable high-pressure conditions, clear skies, and moderate northwesterly winds that limit cooling. Current observations and model runs from agencies tracking the region indicate a peak near 38°C with minimal deviation expected, supported by low humidity variability and negligible precipitation risk. This market-implied consensus reflects the narrow uncertainty band in short-term weather guidance. A sudden increase in cloud cover or an unforecasted shift in the Red Sea breeze could modestly lower the maximum, while an atypical heat surge might push readings higher, though neither appears likely before resolution.