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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; Storms Possible Tomorrow - Jul 11, 8 PM

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

McKinney residents face a heat index of 99F this evening with high humidity. Tomorrow brings a chance of showers and thunderstorms, with heat indices reaching 105F.

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 11, 8 PM local time.*

Current Conditions and Heat

McKinney is experiencing very hot and humid conditions this Saturday evening. The air temperature is currently 91F, but the heat index makes it feel like 99F. Humidity levels are significant, with a dew point of 72F and relative humidity at 53%. Winds are blowing from the south at 15 mph, with gusts reaching 21 mph, while the sky remains clear.

Today and Tonight Forecast

Today, the high temperature reached near 97F under mostly clear skies. The chance of precipitation was minimal at 6%. As evening transitions into tonight, conditions will remain mostly clear. Temperatures will drop to a low around 79F. The heat index is expected to remain high, with values as high as 100. Winds will shift to the south, ranging from 5 to 15 mph.

Tomorrow's Weather and Storm Potential

Tomorrow, the forecast shifts with the arrival of moisture. The high will be near 96F, but the heat index will climb to as high as 105F. Winds will decrease to a south southwest direction at around 5 mph.

The sky will be mostly sunny initially, but a chance of showers and thunderstorms is expected. Specifically, there is a chance for storms between 1pm and 4pm, followed by a general chance of showers and thunderstorms later. The overall chance of precipitation is 50%.

New rainfall amounts less than a tenth of an inch are possible during this period.

Safety Reminders

Given the extreme heat and humidity, it is crucial to stay hydrated and limit midday exertion. The high heat index values pose a risk for heat-related illnesses. Residents should monitor local conditions closely, especially as the chance of storms increases tomorrow.

While there are no active National Weather Service alerts in effect, the combination of high temperatures and potential storm activity requires attention. Ensure that outdoor activities are scheduled during cooler parts of the day and seek air-conditioned environments when possible.

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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