Official temperature observations from Paris-area stations recorded a daily maximum of 24°C on September 30, 2026, under persistently cloudy skies with light rain and southwesterly winds that suppressed daytime heating. This outcome aligns with forecast model consensus from Météo-France and European meteorological services, which projected highs between 22–25°C amid a stable, moist air mass typical for late September. Historical climatology places the average high near 19°C, making the observed value elevated yet within recent variability. The 100% market-implied probability reflects verified data releases, though minor revisions could arise from final quality-controlled station comparisons or differing measurement protocols across sites.