Latest National Weather Service and ensemble model guidance favors a daytime high in the low-to-mid 80s for New York City on May 18, with the 80–83 °F bins carrying the highest implied probabilities because a building ridge is expected to promote warm southerly advection across the Northeast while limiting cloud cover and mixing. Minor spread among GFS, ECMWF, and NAM solutions on the precise timing of an approaching shortwave trough creates the close contest between the 80–81 °F and 82–83 °F outcomes; a slightly earlier trough passage or increased onshore flow could cap readings one bin lower, whereas stronger ridging would push them higher. Climatologically, mid-May Central Park normals sit near 72 °F, so the current setup represents above-average warmth driven by the same large-scale pattern already producing mid-80s readings earlier in the week. Traders are watching the 12 Z and 00 Z model runs on May 17 for final adjustments ahead of the market’s resolution at midnight Eastern Time.