Recent ensemble forecasts from European meteorological centers indicate a daytime maximum of 27–28°C in Paris on August 18, following a cooldown from the mid-August heatwave that produced peaks near 38°C. Atlantic air advection, increased cloud cover, and modest afternoon instability are limiting daytime heating and keeping values 1–3°C above the long-term August climatological average of 25–26°C. Model spread centers on whether residual warmth or additional marine influence will push the official Météo-France maximum across the 28°C threshold, creating the tight 37.5%–32.5% split between those two bins. Traders are monitoring the next high-resolution model runs and surface observations for any late adjustments in boundary-layer moisture or wind direction ahead of the market’s close.