Current forecast models from agencies including Meteo-France indicate a daytime high of 24°C in Paris on September 30, driving the 93.5% market-implied probability for that outcome. Late-September climatology typically features highs near 20–22°C, yet recent high-pressure dominance and southerly flow have supported slightly above-average readings without pushing into the mid-20s. Ensemble guidance shows tight agreement on maximum temperatures, with minimal spread around the 24°C threshold that resolves the market. A cooler-than-expected afternoon breeze or localized measurement variance at official stations could still shift the recorded high downward, though such deviations appear unlikely given the stable synoptic pattern.