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5-day forecast / McKinney, TX

SundaySunny100° / 78°
MondaySunny99° / 78° 5%
TuesdaySunny100° / 79°
WednesdaySunny101° / 79°
ThursdaySunny101° / 79°

McKinney Heat Index Hits 102 Today With Slight Storm Chance - Aug 8, 5 PM

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

Temperatures soar to near 99F in McKinney with a heat index up to 102. A slight chance of showers exists today, but skies clear tomorrow for another hot day.

Cody Esparza

August 8, 20262 min read

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

*As of Aug 8, 5 PM local time.*

Current Conditions and Heat Index

McKinney is experiencing intense heat this evening, with the air temperature at 91F and a feels-like reading of 97F. The atmosphere remains quite humid, evidenced by a dew point of 70F and relative humidity holding at 49%. Winds are blowing from the south-southeast at 14 mph, though gusts have been recorded up to 12 mph. The sky is currently mostly clear as Saturday evening progresses.

Today’s Forecast and Precipitation

The day will remain very hot with a high near 99F. According to the National Weather Service, heat index values could climb as high as 102 during peak hours. There is a slight chance of showers and thunderstorms today, with precipitation chances estimated at 22%.

This aligns with the official forecast which notes a slight chance for these storms before 7pm tonight. Winds will be lighter than current readings, shifting to south-southeast around 5 mph. Temperatures will drop to a low near 77F overnight, though they may rise slightly to around 80F later in the night.

The heat index is expected to reach 101 during this period.

Tomorrow’s Outlook and Safety

Conditions will improve significantly tomorrow with sunny skies and no chance of precipitation. Highs will approach 100F, making it even hotter than today. Heat index values are projected to hit 104, driven by south winds of 5 to 10 mph. Overnight lows will settle near 78F, rising to around 80F later in the night with a heat index up to 102.

There are no active National Weather Service or NOAA weather alerts for this area. However, given the extreme heat and high humidity, residents should prioritize hydration and limit midday exertion. Check on neighbors who may be vulnerable to heat-related illnesses as temperatures remain dangerously high.

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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