Recent forecasts from agencies including the UK Met Office indicate a daytime maximum near 24 °C for Paris on 31 August under partly cloudy skies with light southwesterly flow, following cooler, rain-affected conditions on the 29th. This positions the market’s near-even split between the 24 °C (37 %) and 23 °C (33.5 %) outcomes as a direct reflection of short-range model spread. Small differences in afternoon cloud cover, boundary-layer mixing, or the precise timing of any weak showers can shift the peak by 1 °C, while ensemble guidance and climatological averages near 23.8 °C underscore the narrow uncertainty range traders are pricing. Updated model runs and official briefings in the next 24–48 hours will likely resolve the leading probabilities.