**Persistent warm, humid southerly flow from the Gulf kept overnight temperatures elevated in Houston on October 13, 2026, driving trader consensus toward an 80-81°F low.** High dew points near 77°F, light southeast winds, and partial cloud cover limited radiative cooling under the influence of a stalled warm air mass, resulting in a minimum of 80°F at Houston Intercontinental Airport—well above the 1991-2020 average low of 64.5°F. Official NHC and local NWS guidance had forecasted lows around 77°F amid the pre-frontal pattern, with the cold front not arriving until Friday. This scientific setup produced the market-implied probabilities, where the 80-81°F bin leads at 63% as traders incorporated the latest observations and model consensus on minimal temperature drop.