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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%

McKinney Heat Index Hits 99F With Scattered Storms Possible - Jul 12, 12 PM

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

Temperatures in McKinney are soaring with a heat index near 99F today. A chance of showers and thunderstorms lingers, bringing humidity and potential rainfall to the area.

Cody Esparza

July 12, 20262 min read

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

*As of Jul 12, 12 PM local time.*

Current Conditions and Heat

It is currently Sunday this afternoon in McKinney, TX, where the heat is already palpable. The air temperature stands at 90F, but the humidity is making it feel significantly warmer. The heat index, or "feels like" temperature, is currently 96F.

The relative humidity is at 56%, with a dew point of 72F, indicating a muggy atmosphere. Winds are blowing from the south at 9 mph, with gusts reaching 6 mph. The sky is mostly cloudy, limiting direct sun but trapping heat.

Today and Tonight Forecast

Today, the high will reach near 93F. The National Weather Service indicates a high near 93 with heat index values as high as 99. There is a chance of showers and thunderstorms, with the chance of precipitation at 52%. New rainfall amounts between a quarter and half of an inch are possible. Winds will shift to the south around 5 mph.

Tonight, the low will drop to near 74F, though temperatures may rise to around 76F overnight. The sky will be mostly cloudy. A chance of showers and thunderstorms remains, with a 50% chance of precipitation. Another quarter to half an inch of rain is possible. Winds will be light, from the southeast at 0 to 5 mph.

Tomorrow Outlook

Tomorrow, the high will be near 90F, with a low around 73F. The heat index will again reach values as high as 99. The chance of showers and thunderstorms continues, with a 48% chance of precipitation.

Rain is expected before 7am, then again between 7am and 1pm, and later in the day. New rainfall amounts between a tenth and quarter of an inch are possible. Winds will be from the east southeast at 0 to 5 mph.

There are no active National Weather Service or NOAA weather alerts in effect for this area.

Safety Reminder

Given the high heat index values, it is important to stay hydrated and limit midday exertion. Check on neighbors and elderly relatives who may be vulnerable to extreme heat. If storms develop, seek shelter indoors immediately.

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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