⚠️ Heat Advisory – Houston; Trinity; Madison; Walker; San Jacinto; Polk; Burleson; Brazos; Washington; Grimes; Montgomery; Northern Liberty; Colorado; Austin; Waller; Inland Harris; Chambers; Wharton; Fort Bend; Inland Jackson; Inland Matagorda; Inland Brazoria; Inland Galveston; Southern Liberty; Coastal Harris; Coastal Jackson; Coastal Matagorda; Coastal Brazoria; Coastal Galveston; Matagorda Islands; Galveston Island; Bolivar Peninsula – Thursday, June 18, 2026

Heat Advisory issued June 18 at 9:56AM CDT until June 20 at 10:00PM CDT by NWS Houston/Galveston TX

Details

* WHAT…For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 114 expected. For the Heat Advisory,
heat index values up to 108 expected.

* WHERE…Portions of south central and southeast Texas.

* WHEN…For the Extreme Heat Warning, until 8 PM CDT this evening.
For the Heat Advisory, from 8 PM this evening to 10 PM CDT
Saturday.

* IMPACTS…Heat related illnesses increase significantly during
extreme heat and high humidity events. Hot temperatures and high
humidity may cause heat illnesses.

Instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.

Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.