Houston is under its first heat advisory of 2026, with forecasters warning that heat index values could reach 107 to 114 degrees Thursday and Friday and climb to 110 to 115 degrees over the weekend.

Houston is under its first heat advisory of 2026 as forecasters warn that dangerous humidity could push the heat index into the 110s for the weekend.

The National Weather Service advisory covers Houston and much of Southeast Texas, with local reporting saying heat index values could reach 107 to 114 degrees Thursday and Friday and climb to 110 to 115 degrees over the weekend. The advisory is in effect from 11 a.m. Thursday, June 18, 2026, through 10 p.m. Friday, June 19, 2026.

The setup is being driven by lingering tropical moisture, saturated soils, strong sunshine and building high pressure, all of which make the air feel hotter than the thermometer reading.

What the advisory means

Local coverage says the National Weather Service uses a heat index threshold above 108 degrees for heat advisories in Southeast Texas. That means the combination of heat and humidity is high enough to raise the risk of heat exhaustion and heatstroke, especially for people spending long periods outside.

The advisory covers Houston and nearby communities including The Woodlands, Sugar Land, Galveston and College Station.

Who faces the greatest risk

Officials and forecasters are warning that outdoor workers, older adults, young children and people with health conditions are especially vulnerable.

Residents are being urged to drink plenty of water, stay in air-conditioned spaces when possible, limit time outdoors during the hottest part of the day and never leave children or pets in parked vehicles.

Weekend impact

The timing matters because Friday and Saturday overlap with FIFA World Cup-related crowds and fan events in Houston. Large outdoor gatherings can increase the number of people exposed to dangerous heat for long periods, especially if they are standing in direct sun.

Forecasters say the danger could persist into next week if the heat pattern holds. The main open question is whether the advisory will be extended beyond Friday night or expanded as the weekend unfolds.

Revision note

Initial automated publication.