Houston rolled into Wednesday under clear skies and soupy air, with temperatures already near 81°F and humidity making it feel even heavier. The atmosphere will not cut the city any slack this afternoon: forecasters expect highs around 103°F and heat index values well into the 110s, with only limited cooling overnight. An Extreme Heat Warning is in effect for much of the metro from 11 a.m. to 8 p.m., and anyone out during the hottest hours faces a real risk of heat-related illness.
Afternoon Peak And Timing
The worst of the heat builds in late morning and lingers through mid-afternoon, with inland neighborhoods baking the most while coastal spots run a few degrees cooler. Expect light northwest winds and mostly sunny skies. A few locations could edge above 103°F, and heat index readings may reach the low to mid 110s, possibly up to about 115 to 116 in some inland areas. For full advisory details and the latest timing, see the update from the National Weather Service Houston/Galveston.
Evening Storm Chance
A weak boundary may spark isolated showers or a few thunderstorms after about 5 p.m., mainly over inland areas and into the early evening. Coverage looks spotty, so most neighborhoods will stay dry, but any storm that pops could bring frequent lightning and brief, gusty outflow winds. Rain totals should stay low, which means any storms are more likely to be a quick interruption than a wide-reaching cooldown.
Air Quality And Ozone Action Day
Air-quality officials have called an Ozone Action Day for the Houston–Galveston–Brazoria area, with ozone levels expected to reach ranges that are unhealthy for sensitive groups. Anyone with asthma, COPD, or other respiratory problems should limit prolonged outdoor exertion and stick closely to prescribed medication plans. If you are planning outdoor time this afternoon and evening, keep an eye on local AirNow forecasts and official advisories.
Cooling Options And Safety
The city and partner organizations have opened cooling centers and “Beat the Heat” locations for short-term relief; call 3-1-1 or check the local roundup of cooling-center options for places to go. Drink plenty of water, avoid strenuous activity between 11 a.m. and 8 p.m., and never leave children or pets in parked cars. Check on elderly or vulnerable neighbors, and call for emergency help if anyone shows signs of heat stroke such as confusion, fainting, or seizures. Heat stroke is a life-threatening emergency.
