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

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

82°F

28°C

Humidity 67%
Wind Speed S 17 mph
Barometer 29.97 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 8 Jun 10:55 pm CDT
Extended Forecast for

Knollwood TX

  • Tonight

    Tonight: Mostly clear, with a low around 75. South wind around 10 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny, with a high near 90. Heat index values as high as 98. South southwest wind around 10 mph.

    High: 90 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 76. South wind around 10 mph.

    Low: 76 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90. Heat index values as high as 99. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 77. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 92. South wind around 15 mph, with gusts as high as 25 mph.

    High: 92 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. South wind around 10 mph.

    Low: 75 °F

    Mostly Clear
    then Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. South wind around 5 mph.

    High: 90 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 76. South southeast wind around 5 mph.

    Low: 76 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 75. South wind around 10 mph.
Tuesday
Partly sunny, then gradually becoming sunny, with a high near 90. Heat index values as high as 98. South southwest wind around 10 mph.
Tuesday Night
Mostly clear, with a low around 76. South wind around 10 mph.
Wednesday
Sunny, with a high near 90. Heat index values as high as 99. South wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Clear, with a low around 77. South wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 92. South wind around 15 mph, with gusts as high as 25 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. South wind around 10 mph.
Friday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. South wind around 5 mph.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 76. South southeast wind around 5 mph.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 92. Chance of precipitation is 20%.
Saturday Night
A 50 percent chance of showers. Partly cloudy, with a low around 76.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Sunday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Knollwood TX
 33.66°N 96.6°W (Elev. 797 ft)
Last Update:
6:06 pm CDT Jun 8, 2026
Forecast Valid:
11pm CDT Jun 8, 2026-6pm CDT Jun 15, 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