Recent forecasts from Météo-France and ensemble models indicate a ridge of high pressure building over western Europe, favoring clear skies and southerly flow that could push Paris daytime maxima into the upper 20s Celsius on August 5. Model spreads arise mainly from subtle differences in boundary-layer mixing, low-level moisture advection, and the precise timing of any weak frontal passage, producing daily highs clustered between 27–30 °C. Urban heat-island effects at official stations such as Parc Montsouris further narrow the range traders weigh most heavily. With only 48 hours until resolution, updated 00Z and 12Z runs plus any last-minute cloud-cover observations will dominate shifts among the tightly bunched 27–29 °C outcomes.