Recent Météo-France and European model guidance positions a peak of 37–38°C as the most probable outcome for central Paris on August 13, driven by a persistent high-pressure ridge that advects warmer air northward from the Iberian Peninsula under largely clear skies and light winds. These conditions favor strong daytime heating, further amplified by Paris’s urban heat-island effect, while overnight lows near 22°C limit nocturnal cooling. Shorter-range runs show limited model spread around this range, with only modest uncertainty from possible thin high cloud or slight timing shifts in the thermal maximum. Traders have therefore concentrated probability on the 37°C and 38°C bins, consistent with the latest official outlooks issued within the past 24–48 hours.