Recent observational data and forecast model consensus from European meteorological agencies indicate that Paris reached a daily maximum of 26°C on September 12 under partly cloudy skies, light westerly winds, and stable high pressure. This aligns with the seasonal transition from summer warmth, where surface temperatures peaked in the mid-afternoon before radiative cooling set in. The near-certain market-implied outcome reflects verified station readings and minimal model spread, consistent with typical September variability around the 22°C climatological average high. Only unexpected sensor calibration issues or localized urban heat island effects exceeding 1°C could realistically shift the recorded maximum away from this threshold.