Official forecasts from Météo-France and supporting models indicate Paris reached a daytime maximum of 23°C on October 3 under a stable anticyclone, with morning temperatures near 12–14°C rising steadily amid partly cloudy skies and light north-northeasterly winds. This consensus across ECMWF and GFS runs, combined with observed afternoon peaks around 22–23°C before evening cloud cover limited further warming, underpins the market's 100% implied probability for exactly 23°C. Historical October averages near 18–19°C provide context for the mild anomaly. Only a significant late-day model revision or station-specific measurement variance could alter resolution, though current data show no such divergence.