National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Extreme Heat and Severe Thunderstorms Today

Extreme heat continues today from the central Plains to the lower Mississippi River Valley, over southeast Montana, and from southern California into the Southwest Deserts. Extreme Heat Warnings remain in effect. Severe thunderstorms capable of strong to severe wind gusts and large hail are possible across the Great Lakes into the Ohio Valley today into tonight. Read More >

Hazardous Weather Conditions

Current conditions at

McKinney - McKinney National Airport (KTKI)

Lat: 33.18°NLon: 96.59°WElev: 584ft.

Fair

95°F

35°C

Humidity 41%
Wind Speed SE 12 mph
Barometer 29.82 in (1009.2 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 27 Jul 6:53 pm CDT
Extended Forecast for

3 Miles NNE Wylie TX

Heat Advisory July 27, 07:08pm until July 28, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 27, 07:08pm until July 28, 08:00pm

    NOW until 8:00pm Tue

    Heat Advisory

  • Tonight

    Low: 80 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 108. South southwest wind around 10 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 80. South wind around 10 mph.

    Low: 80 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 98. Heat index values as high as 104. South southwest wind 5 to 10 mph.

    High: 98 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 81. South southeast wind around 10 mph.

    Low: 81 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 98. South southwest wind 5 to 10 mph.

    High: 98 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 81. South southeast wind around 10 mph.

    Low: 81 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and hot, with a high near 99. Southwest wind around 10 mph.

    High: 99 °F

    Hot

Detailed Forecast

Tonight
Mostly clear, with a low around 80. South wind 10 to 15 mph.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 108. South southwest wind around 10 mph.
Tuesday Night
Mostly clear, with a low around 80. South wind around 10 mph.
Wednesday
Sunny, with a high near 98. Heat index values as high as 104. South southwest wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 81. South southeast wind around 10 mph.
Thursday
Mostly sunny, with a high near 98. South southwest wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 81. South southeast wind around 10 mph.
Friday
Mostly sunny and hot, with a high near 99. Southwest wind around 10 mph.
Friday Night
Mostly clear, with a low around 81. South wind around 10 mph.
Saturday
Sunny, with a high near 97.
Saturday Night
Mostly clear, with a low around 77.
Sunday
Sunny, with a high near 95.
Sunday Night
Clear, with a low around 76.
Monday
Sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Wylie TX
 33.08°N 96.48°W (Elev. 499 ft)
Last Update:
6:12 pm CDT Jul 27, 2026
Forecast Valid:
7pm CDT Jul 27, 2026-6pm CDT Aug 3, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation