**Trader sentiment for Jeddah's August 18 maximum temperature centers on the 38–40°C range, reflecting long-term August climatology where mean daily highs average near 38–39°C at coastal stations, combined with a hotter-than-normal summer outlook for 2026.** Saudi Arabia's National Center for Meteorology has projected temperatures 1–2°C above seasonal norms through August, driven by persistent subtropical high pressure, peak solar insolation, and Red Sea moisture that sustains elevated heat indices without widespread cooling. Short-range guidance from sources like AccuWeather and local models shows daily maxima in the mid-to-upper 30s°C through mid-month, with limited day-to-day variability under stable synoptic patterns. The market's implied probabilities align with this baseline while assigning modest weight to a potential 40°C+ outlier if ridge strengthening occurs, consistent with historical records that occasionally exceed 43°C in peak summer. Newer model runs or official updates from the Saudi meteorological service ahead of the 18th remain the key variables that could shift these odds.