Recent forecast model consensus from agencies including Météo-France and the Met Office indicates a shift to cooler, moister northwesterly flow over Paris by September 8, with widespread cloud cover and periods of light rain suppressing daytime heating and limiting nocturnal radiative cooling. This setup follows several warmer, sunnier days earlier in the week, when highs reached 27–29 °C under an anticyclone. Ensemble guidance currently clusters minimum temperatures between roughly 12 °C and 17 °C, with the precise overnight low sensitive to the timing of precipitation onset and boundary-layer moisture. Historical September climatology places the long-term average low near 12 °C, so the current pattern represents a modest negative anomaly driven by Atlantic air advection. Updated high-resolution runs expected over the next 24–48 hours will refine the exact minimum and may shift trader-implied probabilities among the closely bunched 14–17 °C outcomes.