National Weather Service Forecast for: McKinney TX
Issued by: National Weather Service Dallas/Fort Worth, TX
Updated: 1:26 pm CDT Jul 28, 2026
 
This
Afternoon
This Afternoon: Sunny and hot, with a high near 102. Heat index values as high as 111. South wind around 10 mph.
Hot
 Tonight

Tonight: Mostly clear, with a low around 80. South southeast wind 5 to 10 mph.
Mostly Clear
 Wednesday

Wednesday: Mostly sunny and hot, with a high near 101. Heat index values as high as 110. South southeast wind 5 to 10 mph.
Hot
 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 81. South southeast wind 5 to 10 mph.
Partly Cloudy
 Thursday

Thursday: Mostly sunny and hot, with a high near 101. South southwest wind 5 to 10 mph.
Hot
 Thursday
Night
Thursday Night: Mostly clear, with a low around 81. South southeast wind 5 to 10 mph.
Mostly Clear
 Friday

Friday: Mostly sunny and hot, with a high near 103. Southwest wind 5 to 10 mph.
Hot
 Friday
Night
Friday Night: Partly cloudy, with a low around 81. South southwest wind 5 to 10 mph.
Partly Cloudy
 Saturday

Saturday: Sunny and hot, with a high near 99. North wind 10 to 15 mph, with gusts as high as 20 mph.
Hot
Hi 102 °F Lo 80 °F Hi 101 °F Lo 81 °F Hi 101 °F Lo 81 °F Hi 103 °F Lo 81 °F Hi 99 °F

Heat Advisory
 

This Afternoon
 
 Sunny and hot, with a high near 102. Heat index values as high as 111. South wind around 10 mph.
Tonight
 
 Mostly clear, with a low around 80. South southeast wind 5 to 10 mph.
Wednesday
 
 Mostly sunny and hot, with a high near 101. Heat index values as high as 110. South southeast wind 5 to 10 mph.
Wednesday Night
 
 Partly cloudy, with a low around 81. South southeast wind 5 to 10 mph.
Thursday
 
 Mostly sunny and hot, with a high near 101. South southwest wind 5 to 10 mph.
Thursday Night
 
 Mostly clear, with a low around 81. South southeast wind 5 to 10 mph.
Friday
 
 Mostly sunny and hot, with a high near 103. Southwest wind 5 to 10 mph.
Friday Night
 
 Partly cloudy, with a low around 81. South southwest wind 5 to 10 mph.
Saturday
 
 Sunny and hot, with a high near 99. North wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday Night
 
 Mostly clear, with a low around 74.
Sunday
 
 Sunny, with a high near 96.
Sunday Night
 
 Clear, with a low around 74.
Monday
 
 Sunny, with a high near 98.

 

Forecast from NOAA-NWS for McKinney TX.