Weather Alerts For McKinney, TX

# HEADLINE -------------------- EXTREME HEAT WARNING NOW IN EFFECT UNTIL 9 PM CDT MONDAY # DETAILS -------------------- WHAT Dangerously hot conditions with temperatures and heat index values up to 110 expected. WHERE North and Central Texas. WHEN Until 9 PM CDT Monday. IMPACTS Heat related illnesses increase significantly during extreme heat and high humidity events. ISSUED AT Sunday, August 23, 2026 at 11:18 AM CDT ISSUED BY National Weather Service Fort Worth TX HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Extreme heat is dangerous, especially for those without reliable shelter. Limit time outdoors during the hottest time of the day, typically from 2 to 7 PM, rest in the shade when possible, and drink plenty of water. Locate nearby cooling centers through local resources or dial 2-1-1 in Texas. # AREAS AFFECTED -------------------- Freestone, Hunt, Johnson, Leon, Rockwall, Anderson, Bell, Bosque, Collin, Comanche, Cooke, Coryell, Dallas, Delta, Denton, Eastland, Ellis, Erath, Falls, Fannin, Grayson, Hamilton, Henderson, Hill, Hood, Hopkins, Jack, Kaufman, Lamar, Lampasas, Limestone, McLennan, Milam, Mills, Montague, Navarro, Palo Pinto, Parker, Rains, Robertson, Somervell, Stephens, Tarrant, Van Zandt, Wise, Young Including the cities of Bridgeport, Mexia, Hillsboro, Wortham, Comanche, East Tawakoni, Breckenridge, Cameron, Sherman, Hamilton, Flower Mound, Waco, Forney, Jacksboro, Point, Gun Barrel City, Lewisville, Allen, Gatesville, Eastland, Calvert, Nocona, Sulphur Springs, Van, Normangee, Stephenville, Killeen, Valley Mills, Goldthwaite, Ennis, Wills Point, Briar, Kaufman, Emory, Meridian, Lampasas, Cleburne, Dublin, Oak Trail Shores, Centerville, Bonham, Carrollton, Ranger, Gainesville, Glen Rose, Heath, Denton, Rockdale, Clifton, Commerce, Athens, Denison, Edgewood, Weatherford, Grand Saline, Teague, Plano, Oakwood, Canton, Bowie, Cisco, Arlington, Jewett, Franklin, Hico, Marlin, Fort Worth, Cooper, Corsicana, Graham, Midlothian, De Leon, Groesbeck, Rockwall, Hearne, Fort Hood, Paris, Gorman, Burleson, McKinney, Decatur, Greenville, Copperas Cove, Buffalo, Olney, Mineral Wells, Frisco, Terrell, Palestine, Waxahachie, Dallas, Temple, Granbury, and Fairfield

Pollen Index: 8.3 Pollen Level: medium-high Predominant Pollen: Chenopods, Elm and Grass. Based on past pollen counts and expected weather conditions, pollen levels for Monday will be increasing in the high range. This is likely to be caused in part by rising temperatures, strong winds and lower relative humidity.