Recent National Weather Service forecasts and ensemble model guidance indicate a mild spring pattern with southerly flow and mostly clear skies will drive New York City’s highest temperature on May 18 into the low 80s, producing the tight clustering of market-implied odds around the 80–83°F range. Minor differences among model runs arise from subtle variations in afternoon mixing depth, boundary-layer wind speeds, and any residual high-cloud cover that could trim peak readings by a degree or two. Historical May climatology places typical Central Park highs near 74°F, so current guidance reflects a modest warm anomaly. Traders are monitoring the final 24-hour model updates and any last-minute changes in the 500-mb ridge position that could shift the outcome between the leading 82–83°F and 80–81°F bins.