Heat dome to bring first prolonged triple-digit stretch to Harris County
The National Weather Service warned inland Harris County could hit heat index values of 109, as Houston headed into its first prolonged 100-degree stretch of the summer.
The National Weather Service issued an Extreme Heat Warning for inland Harris County and nearby counties on July 21, warning that heat index values could climb to 109 degrees as Houston headed into its first prolonged stretch of triple-digit temperatures this summer. Local forecasts then pushed the danger higher, calling for heat index values up to 112 degrees and 115 degrees.
The hot spell was part of a broader heat-dome pattern over Texas in late July 2026, with dangerous conditions spreading across the central United States. Multiple 100-degree days were possible the following week, and a record high of 102 degrees was expected Wednesday.
Humidity makes the air feel even hotter and raises the risk of dehydration, heat exhaustion and heat stroke. Harris County already has a documented heat-related illness problem: Houston Public Media's December 2024 report found cases in Harris County had risen significantly since 2019, with 73 percent of cases occurring in men. More than a third of cases were in Hispanic or Latino residents, 29 percent in Black or African American residents and 26 percent in White residents, and about 14 percent were job-related.
Hot and humid weather is typical in Harris County and Southeast Texas, and Harris County Public Health projects more extreme heat days, hotter nights, longer summers and higher energy demand across the Greater Houston Area. Outdoor workers, children in sports, delivery drivers, utility crews and people who rely on walking or public transit are especially vulnerable. On June 30, 2023, a Houston resident collapsed at an outdoor construction job in Fort Bend County and died of hyperthermia.
City of Houston and emergency-management guidance urges residents to take the warnings seriously, check on older relatives and neighbors, and keep children, pets and anyone without reliable air conditioning out of the worst of the heat. Even a brief power interruption can become dangerous during a run of triple-digit days, especially in older housing and for households already struggling with utility costs.
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