Current forecasts from the National Weather Service and other models point to Denver's September 12 overnight low falling in the mid-50s to low 60s under mostly clear skies and light winds, supporting the tight clustering of market-implied odds around 52–57°F. Clear conditions promote strong radiative cooling as the ground loses heat to space after sunset, with minimum temperatures typically occurring just before dawn when surface energy loss peaks. Light southeasterly winds limit turbulent mixing that could otherwise bring warmer air downward, while dew points near 40–50°F influence how quickly temperatures drop. Small differences among the leading bins reflect uncertainty in exact wind speeds, any residual afternoon cloud cover, or model variations in boundary-layer cooling rates, all of which can shift the recorded daily minimum by a degree or two. Updated model runs and official observations will likely refine these probabilities as the night progresses.