Recent Météo-France and ECMWF ensemble guidance for the Paris region points to a persistent warm air mass with overnight lows near 20–22°C on July 12, driving the tight clustering of market-implied odds around 21–23°C. Light winds, limited cloud cover, and elevated dew points are expected to moderate nocturnal radiative cooling, keeping the minimum above the historical early-July average of roughly 15–16°C. Small differences in the leading outcomes hinge on forecast details such as exact timing of any thin high clouds, subtle shifts in boundary-layer mixing, or minor adjustments in 850 hPa temperatures within the next 48-hour model runs. Traders are weighting the consensus central tendency while acknowledging that a single updated ensemble could easily shift probabilities among the 21–23°C bins.