Recent forecasts from Météo-France and European models indicate partly cloudy skies with scattered showers over Paris on August 21, limiting daytime heating and supporting the market's tight contest between 23°C and 24°C outcomes. Post-heatwave cooling, westerly flow, and modest humidity have kept highs near seasonal normals of 23–25°C, with ensemble spreads reflecting uncertainty in shower timing and cloud thickness that could trim or boost the peak by 1°C. Official observations through morning show temperatures climbing from 14–17°C lows toward afternoon maxima, with resolution hinging on the warmest hourly reading at standard stations. Traders weigh these variables against historical August variability, where brief clear spells occasionally push readings 1–2°C above guidance.