Recent numerical weather prediction runs from the European Centre for Medium-Range Weather Forecasts and GFS models indicate Jeddah's May 18 maximum will likely fall between 44–47°C, with trader consensus splitting narrowly between the 45°C and 46°C outcomes as the leading implied probabilities. This positioning reflects seasonal warming across the Arabian Peninsula combined with variable Red Sea marine-layer influence, which can moderate peak heating through enhanced humidity and northerly winds. Model spread arises from differing representations of daytime boundary-layer mixing and potential clear-sky solar heating, while historical May averages near 37°C provide baseline context against recent warmer trends. Updated short-range model outputs and official National Center for Meteorology guidance expected within the next 48 hours remain the key variables that could shift these market-implied odds.