Official surface observations and forecast model consensus from Météo-France and regional monitoring confirm a daily maximum of 20°C in Paris on October 12, with partly cloudy skies permitting daytime warming to that threshold before evening cooling. This aligns with current atmospheric conditions, including southerly flow and limited cloud cover that moderated the typical October high near 17°C. Trader consensus at 100% for 20°C reflects verified station data rather than projections, though minor adjustments could arise from final quality-controlled readings or slight variations across Paris-area stations. Resolution hinges on the official daily maximum reported by authoritative meteorological services.