Current short-range forecasts from the National Weather Service and private models indicate Denver overnight lows on September 9 will likely fall in the upper 50s to mid-60s °F, above the 1991–2020 climatological average of 52 °F. A building high-pressure ridge is expected to promote clear to partly cloudy skies and radiational cooling after daytime highs near 80–88 °F, yet recent warm advection and light winds are limiting the depth of nocturnal cooling. Key variables differentiating market bins include exact dew-point depression, urban heat-island effects versus airport observations, and any late-day convection that could alter minimum timing. With outcomes spread across multiple temperature ranges, traders are pricing in genuine forecast uncertainty typical of 48-hour temperature minima.