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5-day forecast / McKinney, TX

SundaySunny98° / 78° 2%
MondaySunny99° / 79° 1%
TuesdaySunny100° / 80° 1%
WednesdaySunny99° / 79°
ThursdaySunny101° / 78°

McKinney Heat and Humidity Rise This Week - Aug 9, 5 AM

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

Temperatures in McKinney will climb into the upper 90s today and tomorrow, with heat indices reaching over 100 degrees. High humidity levels persist as skies remain clear.

Cody Esparza

August 9, 20261 min read

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

*As of Aug 9, 5 AM local time.*

Current Conditions

It is currently Sunday morning in McKinney, TX. The air temperature stands at 75F, with a feels-like reading of 76F. Relative humidity is notably high at 83%, supported by a dew point of 70F. Winds are light from the south at 5 mph, with gusts reaching up to 11 mph. The sky remains clear overhead.

Today and Tonight Forecast

Today will be sunny with a high near 98F. The chance of precipitation is minimal at just 2%. Heat index values are expected to reach as high as 103 due to the combination of heat and moisture. South winds will blow between 5 to 10 mph.

As evening approaches, conditions will remain clear. Lows will settle near 75F initially, but temperatures may rise to around 78F overnight. The south wind will continue at approximately 5 mph. Humidity will remain a factor, with heat index values potentially hitting 101 during the night hours.

Tomorrow Outlook

Tomorrow promises another sunny day in McKinney. Highs will climb near 99F, making it one of the warmer days recently. The chance of rain is negligible at 1%. Heat index values are forecast to reach up to 102. South winds will pick up slightly to around 10 mph, with gusts as high as 20 mph.

Tomorrow night will be clear with a low around 79F. Winds from the south southeast will remain around 10 mph, with gusts potentially reaching 20 mph.

Safety Reminder

With heat indices exceeding 100 degrees and high humidity levels, it is crucial to stay hydrated and limit midday exertion. Check on neighbors who may be vulnerable to extreme heat. There are no active National Weather Service or NOAA weather alerts for this area at this time.

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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