Current forecasts from Météo-France and ensemble models indicate an ongoing heatwave across Île-de-France will produce elevated overnight lows near 19–22°C for Paris on June 21, driven by high daytime maxima near 37°C, mostly clear skies, and light southerly winds that limit nocturnal radiative cooling. The closely matched market-implied odds across 19°C-or-below through 22°C reflect genuine uncertainty in short-range model runs, including potential variations in boundary-layer moisture and exact wind speeds. Historical June minima average around 12–14°C, but the anomalous warmth this week has shifted trader consensus toward milder outcomes while acknowledging that any late-model cooling or increased cloud cover could still alter the final recorded low before resolution.