**Official National Weather Service observations from stations including LaGuardia and Central Park recorded a maximum temperature of 79°F on September 12, 2026, placing the high squarely in the 78-79°F bin.** Mid-September climatology for New York City centers on an average daily high near 78°F, and 2026 conditions aligned closely with this baseline amid stable high pressure and light winds that limited both daytime heating and cooling. Numerical weather prediction guidance from the National Weather Service and commercial models converged on this narrow range days ahead, with minimal spread in ensemble members. Trader consensus at 100% implied probability reflects this strong observational and model agreement. The only realistic challenges would involve a rare post-analysis revision to the official record or an unrecognized microclimate effect at the designated resolution station, both of which are historically uncommon for this well-monitored urban site.