**Trader sentiment for Jeddah’s July 9 maximum temperature centers on uncertainty between 39–41°C, reflected in the tightly bunched leading outcomes (40°C at 32%, 41°C+ at 25%, 39°C at 22.5%).** This distribution aligns with Jeddah’s July climatology, where average daily highs reach 38–40°C (roughly 100–104°F) amid peak summer heating, yet coastal moderation frequently keeps peaks in the upper 30s. The primary scientific drivers are the interplay between Red Sea sea breezes and shifts in northerly or Shamal winds. Persistent onshore flow from the relatively cool marine layer increases humidity and cloud cover, promoting evaporative cooling that caps afternoon maxima near 37–39°C. In contrast, a stronger dry continental or northerly flow reduces moisture advection, allowing greater insolation and pushing readings to 40–42°C. Recent observations (e.g., 39°C on July 4) and short-range model guidance show mixed signals for July 9, with some runs indicating a modest warming trend if winds veer northerly, while others maintain marine influence and forecast 37–38°C. This genuine forecast divergence—typical for coastal sites where small synoptic changes produce 2–3°C swings—explains why no single bin dominates and why traders assign meaningful probability across the 39–41°C range. Updated regional model runs and Saudi Meteorological Authority guidance over the next 24–48 hours will be the key catalysts for any repricing.