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

75°F

24°C

Humidity 83%
Wind Speed S 13 mph
Barometer 29.81 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 17 May 6:50 am CDT
Extended Forecast for

Denison TX

  • Today

    Today: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 89. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 75. South wind around 15 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 89. South wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 89 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74. South southeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 74 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 85. South wind 10 to 15 mph. Chance of precipitation is 70%.

    High: 85 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. East southeast wind 5 to 10 mph becoming north northeast after midnight. Chance of precipitation is 70%.

    Low: 66 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78. North northeast wind around 10 mph.

    High: 78 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Northeast wind 5 to 10 mph.

    Low: 65 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 77. East wind 5 to 10 mph. Chance of precipitation is 60%.

    High: 77 °F

    Showers
    Likely

Detailed Forecast

Today
A slight chance of showers before 10am, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 89. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Tonight
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 75. South wind around 15 mph, with gusts as high as 25 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 89. South wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74. South southeast wind around 15 mph, with gusts as high as 25 mph.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 85. South wind 10 to 15 mph. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. East southeast wind 5 to 10 mph becoming north northeast after midnight. Chance of precipitation is 70%.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78. North northeast wind around 10 mph.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Northeast wind 5 to 10 mph.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 77. East wind 5 to 10 mph. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 79.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Denison TX
 33.78°N 96.55°W (Elev. 650 ft)
Last Update:
6:06 am CDT May 17, 2026
Forecast Valid:
6am CDT May 17, 2026-6pm CDT May 23, 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