Current National Weather Service and model guidance point to overnight lows in the mid to upper 70s for Houston on September 27, yet market odds remain nearly even between 67 °F or below and 86 °F or higher because of lingering uncertainty over the timing and strength of a possible cold front. Persistent high pressure and easterly flow have maintained above-normal warmth and humidity through late September, with recent observations showing daily lows several degrees above the 1991–2020 average of roughly 70 °F. Ensemble spreads in short-range guidance still allow for either a modest cool-air intrusion that could drop minima toward the upper 60s or continued southerly flow keeping readings elevated. Updated model runs and National Weather Service forecast discussions expected over the next 24–48 hours will likely tighten the range and shift trader positioning ahead of resolution.