**Clear skies under a building anticyclonic ridge are the main driver pushing Paris maximum temperatures toward the mid-20s °C on June 13.** Official guidance from Météo-France and ensemble models shows mostly sunny conditions with light westerly winds (9–25 km/h), minimal cloud cover, and strong diurnal heating that favors a peak near 26–27 °C. This aligns with the current market-implied probabilities, where 26 °C leads at 37 % and 27 °C sits at 27.5 %, while 25 °C holds 24 %. June climatology places the long-term average high around 22–24 °C, so the current setup represents a modest positive anomaly driven by subsidence and reduced mixing rather than advection of warmer air. Small differences in boundary-layer moisture or the exact timing of any residual morning cloud will determine whether the official maximum registers at 25 °C or pushes into the upper 20s. Updated model runs and the next Météo-France briefing are the key near-term catalysts that could shift the tight 25–27 °C cluster.