Forecast models from sources including the National Weather Service and private outlets indicate a modest cooldown for Denver on September 17 driven by scattered thunderstorms and associated cloud cover, with overnight lows most likely settling in the mid-to-upper 50s °F. Recent days have featured highs near 80–88 °F and lows in the mid-50s, setting a baseline, while the approaching system introduces variability through precipitation chances of 30–45 % and shifting winds that could either enhance or limit nighttime radiative cooling. Trader-implied odds clustered around the 60–65 °F bins reflect this narrow range of outcomes, tempered by typical model spread in short-range temperature guidance and the possibility of clearer skies or heavier rain altering the minimum. Updated National Weather Service and high-resolution model runs expected in the next 24–48 hours will further refine the range.