National Weather Service Forecast for: McKinney TX
Issued by: National Weather Service Dallas/Fort Worth, TX
Updated: 1:26 am CDT Jun 30, 2026
 
Overnight

Overnight: Mostly clear, with a low around 77. South wind around 10 mph, with gusts as high as 20 mph.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 96. Heat index values as high as 100. South wind 10 to 15 mph, with gusts as high as 20 mph.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 78. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Clear
 Wednesday

Wednesday: Sunny, with a high near 97. Heat index values as high as 101. South wind 5 to 10 mph, with gusts as high as 20 mph.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 78. South southeast wind 5 to 15 mph.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 97. South wind 5 to 10 mph.
Sunny
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 79. Southeast wind 5 to 10 mph.
Partly Cloudy
 Friday

Friday: Mostly sunny, with a high near 98. South wind 5 to 10 mph.
Mostly Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 80. Southeast wind 5 to 10 mph.
Mostly Clear
Lo 77 °F Hi 96 °F Lo 78 °F Hi 97 °F Lo 78 °F Hi 97 °F Lo 79 °F Hi 98 °F Lo 80 °F

 

Overnight
 
 Mostly clear, with a low around 77. South wind around 10 mph, with gusts as high as 20 mph.
Tuesday
 
 Sunny, with a high near 96. Heat index values as high as 100. South wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
 
 Clear, with a low around 78. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
 
 Sunny, with a high near 97. Heat index values as high as 101. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
 
 Mostly clear, with a low around 78. South southeast wind 5 to 15 mph.
Thursday
 
 Sunny, with a high near 97. South wind 5 to 10 mph.
Thursday Night
 
 Partly cloudy, with a low around 79. Southeast wind 5 to 10 mph.
Friday
 
 Mostly sunny, with a high near 98. South wind 5 to 10 mph.
Friday Night
 
 Mostly clear, with a low around 80. Southeast wind 5 to 10 mph.
Independence Day
 
 Mostly sunny and hot, with a high near 100.
Saturday Night
 
 Mostly clear, with a low around 81.
Sunday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 98.
Sunday Night
 
 A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78.
Monday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.

 

Forecast from NOAA-NWS for McKinney TX.