Forecast models from the National Weather Service and private sources converge on a daytime high near 88–90°F for Houston on October 15 under partly cloudy skies and light southeast flow off the Gulf. This places the outcome squarely between the market’s two leading bins, with subtle differences in boundary-layer mixing, cloud cover timing, and afternoon dew-point depression determining whether readings top out in the upper 80s or edge into the low 90s. Recent days have featured similar warm, humid conditions with highs in the upper 80s to low 90s, and the absence of strong frontal passages or significant moisture return keeps the forecast stable. Traders are therefore weighting the latest model runs and observed trends that can shift the daily maximum by just a degree or two.