Latest ensemble forecasts from Météo-France, ECMWF, and GFS, updated within the past 24 hours, show Paris's highest temperature on April 12 clustering tightly around 14-15°C under mostly cloudy skies with scattered showers, driving the near-even trader split between these outcomes at 35.5% and 32.5% implied probabilities. This marks a sharp cooldown from mid-week highs near 26°C, as an Atlantic front ushers cooler air masses, increased cloud cover, and light precipitation that cap daytime heating. Differentiating factors include the precise timing of any afternoon cloud breaks for solar insolation, boundary layer mixing from southwest winds around 10-15 km/h, and urban heat effects in central Paris versus official station measurements. Final Météo-France bulletins overnight could refine guidance before observations resolve the market.