Forecast models from sources including Météo-France-aligned updates and GFS data project a daytime high of 24–25°C in Paris on October 4, 2026, driven by a strong high-pressure system (around 1028 hPa) promoting clear to partly cloudy skies and light northeasterly winds that limit mixing and allow surface warming. This exceeds the October climatological maximum of roughly 16–17°C, reflecting unseasonable warmth from persistent anticyclonic conditions. Afternoon peaks near 25°C appear most probable, though minor model spread and exact station measurement introduce limited uncertainty around the 24–26°C range. Trader consensus aligns closely with these outputs, with implied probabilities concentrated on 24–25°C outcomes reflecting high confidence in stable, dry conditions through peak heating hours.