**Forecast models from sources like the Met Office and regional services consistently project a daytime high of 35–37°C in Jeddah on September 30 under clear to mostly sunny skies, light to moderate westerly winds off the Red Sea, and typical late-September humidity levels around 50–70%.** This aligns with seasonal climatology for the coastal city, where solar heating peaks without significant cloud cover or synoptic disturbances to moderate temperatures. Recent model runs show stable high-pressure conditions with minimal day-to-day variability, supporting the market's heaviest weighting on 36°C (46%) and 35°C (33%), followed by 37°C (15.5%). Traders appear to price in the narrow uncertainty band typical of short-range numerical weather prediction for this region, where small shifts in boundary-layer moisture or wind could nudge the exact maximum within that range before official observations finalize the outcome.