Strong model consensus from sources including GFS and European forecasting centers supports an overnight minimum near 11°C in Paris under clear, high-pressure conditions favoring radiative cooling, aligning with the 98% market-implied probability for that outcome. This reflects typical late-September climatology with average lows around 11°C, reinforced by current observations of light winds and minimal cloud cover that enhance surface heat loss. Trader positioning incorporates these stable atmospheric patterns and limited model spread. A realistic challenge could arise from unexpected increases in low-level moisture, stronger winds, or timing shifts in frontal passages that limit cooling and push the minimum above 12°C, though such deviations appear unlikely given the latest guidance.