Houston, Texas – Triple-digit heat indices and dangerous humidity are pushing southeast Texas into another day of summer-like extremes, with heat illness a growing concern for outdoor workers and vulnerable groups.
According to the National Weather Service Houston-Galveston office, inland areas will see high temperatures in the mid-to-upper 90s Sunday, with peak heat index values soaring between 101°F and 107°F. The Wet Bulb Globe Temperature (WBGT)—a measure that accounts for heat, humidity, sun, and wind—will remain at high risk levels (4 of 5) from noon to 6 p.m., especially across Houston and surrounding inland counties.
Most of Southeast Texas remains under a Major HeatRisk (Level 3 of 4), with only slightly cooler conditions at the coast. The agency warns that strenuous outdoor activity during peak hours could lead to heat exhaustion or worse. Residents are urged to stay indoors during the hottest part of the day, check on the elderly, and ensure pets and children are not left in vehicles.
With minimal overnight cooling, health risks accumulate quickly. This marks the second consecutive day of these elevated temperatures—a pattern more typical of mid-July than early June.
Heat alerts remain active through Sunday evening. More advisories may be issued as heat persists into the week.
