Latest National Weather Service and ensemble model guidance point to a daytime high near 88°F for Houston on May 16 under partly cloudy skies and southerly flow near 10–15 mph, placing the market’s near-even split between the 88°F-or-higher and 86–87°F bins. Surface heating beneath a weak upper ridge supports efficient insolation, while dew points in the low-to-mid 70s add modest evaporative cooling that keeps peak temperatures from surging much above the 87°F climatological normal. Recent GFS and ECMWF runs show a narrow 2–3°F spread driven mainly by afternoon cumulus development timing and boundary-layer mixing depth; any earlier or thicker cloud shield would favor the 86–87°F outcome, whereas clearer conditions would push readings into the low 90s. With resolution imminent via official airport observations, traders are weighting the latest 12Z model updates most heavily.