Persistent high pressure and a moist subtropical airmass kept overnight lows elevated across the Houston area on September 16, 2026, with National Weather Service observations and model guidance converging on a minimum near 78–79 °F at primary reporting stations. Recent climatological data show September lows typically averaging 72–73 °F, but the absence of frontal passages or enhanced radiational cooling this week supported the warmer outcome. Forecasters noted dew points remaining in the mid-70s, limiting temperature drops after sunset. The market-implied 99.6 % probability on 78–79 °F reflects trader consensus anchored in these verified conditions. An unexpected late-day cold-air surge or station-specific microclimate effect could still shift the recorded low into an adjacent bin, though such scenarios appear unlikely given the stable synoptic pattern.