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.

Overcast

62°F

17°C

Humidity 93%
Wind Speed S 9 mph
Barometer 29.95 in
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 9 Mar 4:35 am CDT
Extended Forecast for

Grayson County Airport TX

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South southwest wind around 10 mph.

    Low: 59 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A 10 percent chance of showers and thunderstorms before 7am. Partly sunny, with a high near 81. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 81 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 67. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 78. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 61. South wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 61 °F

    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 70. South wind 10 to 20 mph becoming north in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 60%.

    High: 70 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before 1am. Mostly clear, with a low around 41. North wind 10 to 20 mph, with gusts as high as 25 mph.

    Low: 41 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 64. North wind around 5 mph becoming south in the afternoon.

    High: 64 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 48. South wind 5 to 10 mph.

    Low: 48 °F

    Clear

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South southwest wind around 10 mph.
Monday
A 10 percent chance of showers and thunderstorms before 7am. Partly sunny, with a high near 81. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Monday Night
Increasing clouds, with a low around 67. South wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 78. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm. Low around 61. South wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 70. South wind 10 to 20 mph becoming north in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 60%.
Wednesday Night
A 20 percent chance of showers before 1am. Mostly clear, with a low around 41. North wind 10 to 20 mph, with gusts as high as 25 mph.
Thursday
Sunny, with a high near 64. North wind around 5 mph becoming south in the afternoon.
Thursday Night
Clear, with a low around 48. South wind 5 to 10 mph.
Friday
Sunny, with a high near 76.
Friday Night
Clear, with a low around 54.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 59.
Sunday
Sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayson County Airport TX
 33.71°N 96.66°W (Elev. 797 ft)
Last Update:
4:37 am CDT Mar 9, 2026
Forecast Valid:
4am CDT Mar 9, 2026-6pm CDT Mar 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation