Forecasts from NOAA-affiliated sources and meteorological models indicate Denver's overnight low on September 12 will likely settle near 59–60°F under partly cloudy skies, light southeast winds, and modest humidity. Radiative cooling after sunset is moderated by residual cloud cover and downslope flow off the Rockies, which limits the drop compared to the climatological average low of about 51°F. Clearer intervals could allow greater longwave heat loss and push the minimum into the mid-50s, while increased mixing from gusts near 15–25 mph or lingering moisture from afternoon convection would support readings in the low 60s. These variables create tight clustering in mid-range bins, with market-implied odds reflecting uncertainty in exact nocturnal boundary-layer evolution rather than any single dominant driver.