Severe Weather and Heavy Rain from the Great Lakes to the Mid-Atlantic; Heat Persists in the East

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected from the Upper Ohio Valley into the southern Mid-Atlantic today and portions of the central Appalachians and Carolinas on Saturday. Monsoonal moisture will bring a flash flooding threat to the Desert Southwest. Sweltering heat persists from the Plains to the southern Mid-Atlantic through tonight. Read More >

Current conditions at

McKinney - McKinney National Airport (KTKI)

Lat: 33.18° N Lon: 96.59° W Elev: 584 ft.

Fair

78°F

26°C

Humidity 82%
Wind Speed Calm
Barometer 29.95 in (1013.4 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 5 Sep 7:53 am CDT
Detailed forecast for

Collin County

Today
Sunny, hot with highs in the upper 90s. South winds around 5 mph, becoming southeast this afternoon. Heat index values up to 106.
Tonight
Clear. Lows in the upper 70s. South winds 5 to 10 mph.
Sunday
Sunny, hot with highs around 100. Southeast winds 5 to 10 mph. Heat index values up to 106.
Sunday Night
Mostly clear. Lows in the upper 70s. South winds around 5 mph.
Labor Day
Sunny, hot with highs around 100. South winds 5 to 10 mph. Heat index values up to 107.
Monday Night
Mostly clear. Lows in the upper 70s.
Tuesday
Sunny, hot with highs around 100. Heat index values up to 110 in the afternoon.
Tuesday Night
Mostly clear. Lows in the upper 70s.
Wednesday
Sunny, hot with highs in the upper 90s. Heat index values up to 110 in the afternoon.
Wednesday Night
Mostly clear. Lows in the upper 70s.
Thursday
Sunny, hot with highs in the upper 90s. Heat index values up to 110 in the afternoon.
Thursday Night
Mostly clear. Lows in the upper 70s.
Friday
Mostly sunny. A 20 percent chance of showers in the morning. Hot with highs in the upper 90s. Heat index values up to 110 in the afternoon.



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608 AM CDT Sat Sep 5 2026
 
 

Additional Resources

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Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database