Recent ensemble forecasts from major models indicate peak temperatures of 28–29°C in Paris on August 5, driven by a strengthening high-pressure ridge promoting southerly warm-air advection and reduced cloud cover under neutral-to-positive NAO conditions. A developing strong El Niño, with Niño 3.4 anomalies exceeding +2°C, tilts seasonal probabilities toward above-average European summer warmth relative to the 1991–2020 baseline of ~24–25°C. Key differentiating factors include precise timing of any frontal passage or diurnal heating peaks, which short-range guidance shows can shift the daily maximum by 1–2°C, alongside Paris’s urban heat island amplifying readings at official stations like Montsouris. Updated runs from the European Centre for Medium-Range Weather Forecasts and NOAA’s Global Forecast System, due within 24 hours, will refine these probabilities ahead of market resolution.