Forecast uncertainty for New York City’s maximum temperature tomorrow centers on subtle differences in model guidance for daytime heating under partly sunny skies and light southerly flow. National Weather Service and ensemble runs cluster the high near 75–80°F, with minor variations in boundary-layer mixing, cloud cover timing, and dewpoint advection creating the tight split between the 78–79°F and 80–81°F bins that together exceed 69% implied probability. Recent early-June warmth has elevated baseline soil and air temperatures, while the absence of strong cold advection or significant precipitation keeps values above seasonal normals yet below record thresholds. Traders are weighting the latest high-resolution model updates and any afternoon sea-breeze effects that could cap or boost readings by 1–2°F before resolution.