**Trader sentiment for NYC's lowest temperature on August 20 centers on a mild overnight low near 70–73°F, with the 70–71°F bin leading at 45.5% implied probability.** Recent National Weather Service and private model guidance, including Met Office and AccuWeather outlooks updated on or before August 19, consistently point to a minimum around 70–74°F under partly cloudy skies, light winds, and elevated dew points that suppress radiative cooling. This aligns with the broader August 2026 pattern of above-average temperatures, as the Climate Prediction Center assigns a 40–50% likelihood of warmer-than-normal conditions across the New York City area, consistent with climatological August lows near 67°F but elevated by persistent warmth and humidity. Urban heat island effects in Central Park further support higher minima by reducing nocturnal temperature drops compared to rural sites. No strong cold front or clear, dry air mass is expected to arrive in time to push readings into the mid-60s, keeping lower bins (68–69°F and below) at combined probabilities under 30%. The narrow clustering around 70–73°F reflects model consensus on limited overnight cooling potential ahead of the daily high near 84°F. Updated NWS forecast discussions or new model runs on the morning of August 20 remain the primary near-term catalysts that could shift these market-implied odds.