**Recent short-range forecasts for Paris on August 31, 2026, consistently point to a daily minimum in the 14–17 °C range, with many guidance products clustering near 16–17 °C.** This has concentrated trader positioning on 17 °C (66.5 % implied probability), with 16 °C and 18 °C as clear secondary outcomes. Key drivers include persistent southwesterly flow off the Atlantic, widespread cloud cover, and limited nocturnal radiative cooling. Overnight lows on 30–31 August are already running 17–18 °C under overcast skies; similar conditions on the 31st are expected to keep the minimum from falling toward the long-term climatological average of ~13.4 °C. Ensemble and deterministic runs (GFS-based and others) show only modest day-to-day variability, with highs near 22–24 °C and the primary uncertainty tied to the exact timing and extent of any clearing overnight. Model agreement on a mild minimum, combined with the narrow historical spread for late-August nights under comparable synoptic patterns, explains why probabilities have coalesced tightly around 16–18 °C rather than lower or higher extremes. Updated model cycles and any late-day clearing signals will be the next potential catalysts for shifts in these market-implied odds.