Recent model runs from Météo-France and ECMWF place Paris’s July 11 maximum between 34–36 °C amid a persistent high-pressure ridge and subsiding air that favors strong daytime heating under mostly clear skies. Low-level winds remain light, limiting mixing and allowing the urban heat-island effect to amplify readings at official stations. Ensemble spread arises mainly from minor differences in forecast cloud timing and boundary-layer moisture; a slightly earlier marine layer or isolated convective cell could cap the peak near 34 °C, while continued subsidence and drier air would push it toward 36–37 °C. With resolution only 48 hours away, traders are weighting the latest 12–18 UTC model cycles most heavily, producing the tight clustering around the 34–36 °C outcomes.