National Weather Service Forecast for: McKinney TX
Issued by: National Weather Service Dallas/Fort Worth, TX
Updated: 6:06 pm CDT Jun 18, 2026
 
Tonight

Tonight: A chance of showers and thunderstorms between 1am and 4am, then showers and possibly a thunderstorm after 4am. Low around 76. East wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Mostly Cloudy
then T-storms
 Juneteenth

Juneteenth: Showers and possibly a thunderstorm, mainly before 10am, then a chance of showers and thunderstorms after 10am. High near 84. North northeast wind 5 to 10 mph becoming east in the afternoon. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
T-storms then
Chance
T-storms
 Friday
Night
Friday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. East wind 5 to 10 mph. Chance of precipitation is 40%.
Chance
T-storms
 Saturday

Saturday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 90. Heat index values as high as 102. South southeast wind 5 to 10 mph.
Chance
T-storms
 Saturday
Night
Saturday Night: Partly cloudy, with a low around 76. South southeast wind around 10 mph.
Partly Cloudy

 Sunday

Sunday: Mostly sunny, with a high near 95. South wind 15 to 20 mph, with gusts as high as 30 mph.
Mostly Sunny

 Sunday
Night
Sunday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 78. South wind 10 to 20 mph, with gusts as high as 25 mph.
Clear then
Chance
Showers
 Monday

Monday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 95. South wind around 15 mph, with gusts as high as 20 mph.
Slight Chance
T-storms
 Monday
Night
Monday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76. South wind 5 to 10 mph.
Chance
T-storms
Lo 76 °F Hi 84 °F Lo 74 °F Hi 90 °F Lo 76 °F Hi 95 °F Lo 78 °F Hi 95 °F Lo 76 °F

 

Tonight
 
 A chance of showers and thunderstorms between 1am and 4am, then showers and possibly a thunderstorm after 4am. Low around 76. East wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Juneteenth
 
 Showers and possibly a thunderstorm, mainly before 10am, then a chance of showers and thunderstorms after 10am. High near 84. North northeast wind 5 to 10 mph becoming east in the afternoon. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Friday Night
 
 A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. East wind 5 to 10 mph. Chance of precipitation is 40%.
Saturday
 
 A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 90. Heat index values as high as 102. South southeast wind 5 to 10 mph.
Saturday Night
 
 Partly cloudy, with a low around 76. South southeast wind around 10 mph.
Sunday
 
 Mostly sunny, with a high near 95. South wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday Night
 
 A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 78. South wind 10 to 20 mph, with gusts as high as 25 mph.
Monday
 
 A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 95. South wind around 15 mph, with gusts as high as 20 mph.
Monday Night
 
 A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76. South wind 5 to 10 mph.
Tuesday
 
 A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 92.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Wednesday
 
 A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 92.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Thursday
 
 A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 94.

 

Forecast from NOAA-NWS for McKinney TX.