Recent National Weather Service and AccuWeather model runs indicate unseasonably cool air advection into the Northeast ahead of a weak front, supporting overnight lows in the mid-to-upper 60s for New York City on August 21. Clear to partly cloudy skies under high pressure will promote efficient radiative cooling after sunset, while light winds limit mixing of warmer air from aloft. These conditions align with long-range outlooks from the Climate Prediction Center showing below-normal temperatures for late August, shifting trader consensus toward the 66–69°F range as the most probable minimum at Central Park or LaGuardia. Updated short-range guidance and any changes in cloud cover or dew points over the next 12–18 hours remain the key variables that could adjust final market-implied probabilities.