Recent National Weather Service and model guidance for New York City on August 21 points to a high near 78–80°F, with partly sunny skies, a modest chance of afternoon showers, and light northerly winds that limit daytime heating. These conditions place the market’s leading bins—78–79°F, 80–81°F, and 76–77°F—within typical forecast uncertainty ranges driven by the timing and coverage of any convection and the precise boundary-layer moisture profile. Historical August climatology for Central Park shows a mean daily maximum of roughly 83°F, so current cooler steering patterns and higher cloud potential are the main factors keeping probabilities concentrated below that average while leaving the outcome sensitive to the next model runs and observed trends through Friday morning.