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5-day forecast / McKinney, TX

TuesdaySunny102° / 80°
WednesdaySunny101° / 81° 1%
ThursdayMostly Sunny101° / 81° 2%
FridayMostly Sunny103° / 82° 6%
SaturdaySunny100° / 76° 7%

Dangerous Heat Index Hits 101F in McKinney Saturday Afternoon - Jul 18, 4 PM

McKinney weather, updated every four hours — local forecasts you can trust.

McKinney residents face dangerous heat with a heat index of 101F today. Highs near 96F and 98F tomorrow bring continued humidity and clear skies.

Cody Esparza

July 18, 20262 min read

National Weather Service radar for North Texas (KFWS)
National Weather Service radar for North Texas (KFWS)

*As of Jul 18, 4 PM local time.*

Dangerous Heat Conditions

McKinney is currently under the influence of dangerous heat conditions this Saturday afternoon. The air temperature stands at 93F, but the combination of heat and moisture pushes the feels-like temperature to 101F. Relative humidity is at 50%, with a dew point of 72F, creating a muggy atmosphere that intensifies the perceived heat.

Winds are blowing from the south southwest at 15 mph, with gusts reaching 18 mph, while the sky remains clear.

Forecast for Today and Tomorrow

Today, the high will reach near 96F, with a low near 77F. The chance of precipitation is minimal at 2%, and skies will be mostly sunny. Heat index values are expected to climb as high as 103 during the day.

As evening approaches, skies will transition to partly cloudy with a low around 77. Temperatures may rise slightly to around 79 overnight, with heat index values staying as high as 101. Winds will shift to the south, ranging from 5 to 15 mph.

Tomorrow, conditions will remain sunny with a high near 98F and a low near 78F. The chance of precipitation is 3%. Heat index values are forecast to reach as high as 103.

Winds will be from the south southwest at 5 to 10 mph. Overnight, skies will be mostly clear, with temperatures rising to around 80. Heat index values will remain as high as 102, with south winds continuing at 5 to 10 mph.

Safety Reminders

With heat index values exceeding 100F, it is critical to stay hydrated and limit midday exertion. Wear lightweight, light-colored clothing and seek air-conditioned environments when possible. Check on neighbors, especially the elderly and those without reliable cooling.

Avoid leaving children or pets in vehicles, as temperatures inside can rise rapidly. Stay aware of the signs of heat exhaustion and heat stroke, and seek medical attention if symptoms appear.

National Weather Service radar for North Texas (KFWS)

Sources

https://radar.weather.gov

https://api.weather.gov

https://open-meteo.com

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Cody Esparza

Cody Esparza covers McKinney city hall, the council, and county government.

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