Trader sentiment for New York City’s June 15 high temperature centers on closely matched forecasts placing the daily maximum near 78–81 °F, reflecting modest uncertainty in short-range model guidance. Ensemble runs from the National Weather Service and European Centre for Medium-Range Weather Forecasts show a weak surface high and light southerly flow under partly cloudy skies, limiting daytime heating while urban heat-island effects and boundary-layer mixing add a few degrees of local variability. Dew-point values near 60 °F and afternoon wind speeds below 10 mph support the narrow spread between the 78–79 °F and 80–81 °F bins. A slight eastward shift in a weak cold front or thicker cloud cover could trim the peak by 1–2 °F, while clearer conditions would favor the upper end; updated model cycles and afternoon observations will narrow the range before resolution.