Forecast models for Houston on June 21 point to a daytime high in the upper 80s to low 90s, consistent with June climatology where normals reach 92–93°F at Bush Intercontinental Airport. Afternoon sea-breeze convergence and scattered convection—common under weak steering flow and high Gulf moisture—introduce the main uncertainty, as earlier or more widespread cloud cover and showers would cap temperatures near 88–89°F while clearer skies or delayed storms could push readings to 92–93°F. Recent model consensus shows limited spread around this range, with no strong frontal or subtropical ridge signal to drive extremes. Traders appear to weight the most likely outcomes around the 88–91°F bins, reflecting both historical variability in daily maxima and the modest skill of 24–48-hour temperature forecasts in a humid subtropical regime.