Recent Météo-France and ECMWF model runs position 38–39°C as the most probable peak for Paris on August 14, with afternoon temperatures forecast to reach 38°C under persistent high pressure, weak winds, and clear skies that favor strong daytime heating. These conditions build on an ongoing European heatwave, where southerly advection of warm air and limited cloud cover have already produced highs near 37–40°C in recent days. Ensemble guidance shows low spread around the upper 30s, with only modest potential for 40°C if mixing remains suppressed, explaining the market’s heavy weighting toward 39°C (58.5%) and 38°C (25.5%). Official forecasts issued in the past 24 hours have remained stable, limiting volatility in implied probabilities ahead of tomorrow’s observation.