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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%

Humid Start to Sunday in McKinney with Afternoon Storms Expected - Jul 12, 4 AM

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

McKinney residents face high humidity and a chance of showers and thunderstorms today. Current conditions show a dew point of 72F with clear skies, while heat indices may reach 99F.

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, 4 AM local time.*

Current Conditions and Humidity

It is currently Sunday overnight in McKinney, TX, and the air feels quite heavy with moisture. The current air temperature is 79F, but the heat index makes it feel like 82F. Relative humidity sits at 79%, driven by a dew point of 72F.

Despite the mugginess, the sky remains clear. Winds are light from the south at 5 mph, though gusts have reached up to 18 mph.

Today and Tonight Forecast

A chance of showers and thunderstorms is expected today. The sky will be partly sunny with a high near 93F. Heat index values could climb as high as 99F, making it feel significantly hotter than the actual air temperature.

South winds will remain around 5 mph. There is a 52% chance of precipitation, with new rainfall amounts between a quarter and half of an inch possible.

As evening approaches, conditions will shift. Tonight brings a chance of showers and thunderstorms, particularly after 4am. The sky will turn mostly cloudy with a low around 74F, though temperatures may rise to around 76F overnight. Southeast winds will be calm, ranging from 0 to 5 mph. The chance of precipitation remains at 50%, with another quarter to half an inch of rain possible.

Tomorrow Outlook

The pattern continues into tomorrow with a chance of showers and thunderstorms. The morning hours before 7am and the period between 7am and 1pm are highlighted for potential storms, followed by scattered chances later in the day. Expect partly sunny skies with a high near 90F.

Heat index values will again reach up to 99F. Winds will be light from the east southeast at 0 to 5 mph. There is a 50% chance of precipitation, with new rainfall amounts between a tenth and quarter of an inch possible.

Tomorrow night will see a chance of showers and thunderstorms before 7pm. The sky will be partly cloudy with a low around 73F. Southeast winds will remain light at 0 to 5 mph, with a 40% chance of precipitation.

Safety Reminder

With heat indices nearing 100F and high humidity, stay hydrated and limit midday exertion. Keep an eye on the sky for developing storms, especially in the afternoon and overnight hours.

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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