Persistent summer heat across southeast Texas keeps the daily minimum temperature in Houston on August 22 tightly clustered near climatological norms, with National Weather Service guidance pointing to overnight lows in the upper 70s to low 80s amid mostly clear skies and light winds. High atmospheric moisture limits radiative cooling overnight, while the urban heat island and Gulf sea-breeze circulation further moderate temperature drops. Recent model runs show only modest spread driven by small differences in cloud cover and boundary-layer mixing, producing the market’s near-even implied odds across the 74–83 °F range. Any late-day thunderstorms or a subtle wind shift could shave a degree or two from the low, whereas continued subsidence would hold readings closer to 80–81 °F.