Recent National Weather Service and ensemble model guidance for Denver on September 20 point to scattered thunderstorms and overnight radiative cooling under partly cloudy skies, anchoring trader focus on lows between 48–55 °F. The 24.5 % and 24.0 % probabilities on the 54–55 °F and 52–53 °F bins reflect the latest forecast consensus of a minimum near 50–53 °F, while the closely matched 48–49 °F and 50–51 °F shares capture residual uncertainty in the timing of any clearing and wind speeds that modulate surface cooling. This range sits slightly above the 1991–2020 climatological average low of 47.6 °F, consistent with above-normal temperatures persisting into late September. Updated model runs and the next NWS point forecast release remain the key near-term catalysts that could shift the distribution before resolution.