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5-day forecast / McKinney, TX

SundaySunny99° / 77° 8%
MondaySunny99° / 78° 6%
TuesdaySunny99° / 79° 1%
WednesdaySunny100° / 79°
ThursdaySunny101° / 78°

McKinney Heat Index Climbs Near 103 Today - Aug 9, 12 PM

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

Temperatures in McKinney are soaring this Sunday afternoon with a high near 98F and heat index values reaching 103. Humidity levels remain elevated, making it feel even hotter.

Cody Esparza

August 9, 20262 min read

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

*As of Aug 9, 12 PM local time.*

Current Conditions

It is currently Sunday this afternoon in McKinney, TX, where the air temperature stands at 93F. The combination of heat and moisture is creating a stifling atmosphere, with the feels-like temperature reaching 99F. Relative humidity is at 47%, supported by a dew point of 70F.

Winds are blowing from the south at 8 mph, with gusts recorded up to 7 mph. The sky remains clear overhead.

Today and Tonight Forecast

The heat will persist through the day today, with a high near 98F. According to the National Weather Service, heat index values could climb as high as 103 during peak hours. South winds will range from 5 to 10 mph. The chance of precipitation is minimal at just 2%, leaving skies sunny.

As evening approaches tonight, conditions will remain clear. Temperatures will drop to a low near 78F, though they may rise slightly to around 80F overnight. Heat index values are expected to stay high, reaching up to 101. South winds will continue at around 10 mph.

Tomorrow Outlook

Tomorrow brings another day of intense heat for McKinney. The forecast calls for a high near 99F under sunny skies. Heat index values will peak around 102. Winds from the south will average around 10 mph, with gusts potentially reaching 20 mph. The chance of rain is negligible at 1%.

Tonight tomorrow night will be clear, with a low around 79F. Heat index values may reach 100. South southeast winds will blow around 10 mph, with gusts as high as 20 mph.

Safety Reminder

With temperatures and heat indices consistently in the upper 90s to low 100s, staying hydrated is critical. Limit outdoor exertion during the hottest parts of the day and check on neighbors who may be vulnerable to extreme heat. There are no active weather alerts at this time, but the persistent heat requires caution.

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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