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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 106 Tomorrow Amid Humid Start - Jul 19, 8 AM

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

High humidity and rising temperatures define the forecast for McKinney. Today brings a high near 97F with a slight chance of storms, while tomorrow climbs to 100F with a heat index up to 106F.

Cody Esparza

July 19, 20262 min read

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

*As of Jul 19, 8 AM local time.*

Current Conditions and Humidity

It is currently Sunday this morning in McKinney, TX, where the air feels noticeably heavy. The current air temperature stands at 81F, but the relative humidity is at 79%, making it feel like 85F. The dew point is 73F, indicating quite humid conditions that linger in the atmosphere.

Winds are blowing from the south southwest at 8 mph, with gusts reaching up to 19 mph. The sky remains clear overhead, offering no immediate relief from the moisture in the air.

Today and Tonight Forecast

Temperatures will climb significantly throughout the day. The high today is expected to reach near 97F, with the low settling near 79F. While the morning starts sunny, there is a slight chance of showers and thunderstorms developing after 4pm.

The chance of precipitation is listed at 15% for the day, though the official forecast notes a 20% chance. Heat index values are projected to peak as high as 104F during the afternoon hours. Winds will remain light, shifting to a south direction at 5 to 10 mph.

As evening approaches, the chance for storms continues before 7pm. The sky will become mostly clear overnight. Temperatures will drop to a low around 79F, though they may rise slightly to around 81F later in the night. The heat index will remain elevated, reaching up to 102F. There are no active National Weather Service or NOAA weather alerts in effect for this area.

Tomorrow Outlook

The heat will intensify as the week progresses. Tomorrow will be sunny with a high near 100F. The heat index is forecast to reach as high as 106F, creating dangerous heat stress conditions for those outdoors.

Winds will be light, coming from the southwest at around 5 mph. The chance of precipitation drops to just 2%, offering dry skies but relentless heat. Temperatures will settle to a low near 80F, with overnight highs rising to around 82F and heat indices hitting 104F.

Safety Reminder

With heat indices exceeding 100F, it is critical to stay hydrated and limit midday exertion. Check on elderly neighbors and ensure pets have access to cool water and shade. Avoid direct sun exposure during peak heat hours to prevent heat-related illnesses.

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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