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.

Partly Cloudy

79°F

26°C

Humidity 89%
Wind Speed NE 6 mph
Barometer 29.87 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 18 Jun 11:55 pm CDT
Extended Forecast for

Denison TX

  • Overnight

    Overnight: Showers and thunderstorms likely, mainly after 4am. Cloudy, with a low around 72. North wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 72 °F

    T-storms
    Likely

  • Juneteenth

    Juneteenth: Showers and thunderstorms likely before 7am, then showers likely and possibly a thunderstorm between 7am and 10am, then a chance of showers and thunderstorms after 10am. Cloudy, with a high near 82. North northeast wind 5 to 10 mph becoming east southeast in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 82 °F

    T-storms
    Likely then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. East wind around 5 mph. Chance of precipitation is 40%.

    Low: 73 °F

    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly between 10am and 1pm. Partly sunny, with a high near 88. Heat index values as high as 98. South southeast wind 5 to 10 mph.

    High: 88 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75. Southeast wind around 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 93. South southwest wind around 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly clear, with a low around 77. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 77 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 91. South southwest wind around 10 mph.

    High: 91 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 74. South southeast wind around 5 mph becoming east in the evening. Chance of precipitation is 60%.

    Low: 74 °F

    Showers
    Likely

Detailed Forecast

Overnight
Showers and thunderstorms likely, mainly after 4am. Cloudy, with a low around 72. North wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Juneteenth
Showers and thunderstorms likely before 7am, then showers likely and possibly a thunderstorm between 7am and 10am, then a chance of showers and thunderstorms after 10am. Cloudy, with a high near 82. North northeast wind 5 to 10 mph becoming east southeast in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Friday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. East wind around 5 mph. Chance of precipitation is 40%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly between 10am and 1pm. Partly sunny, with a high near 88. Heat index values as high as 98. South southeast wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 75. Southeast wind around 10 mph.
Sunday
Mostly sunny, with a high near 93. South southwest wind around 15 mph, with gusts as high as 25 mph.
Sunday Night
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly clear, with a low around 77. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Monday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 91. South southwest wind around 10 mph.
Monday Night
Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 74. South southeast wind around 5 mph becoming east in the evening. Chance of precipitation is 60%.
Tuesday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 88.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Denison TX
 33.75°N 96.55°W (Elev. 758 ft)
Last Update:
6:06 pm CDT Jun 18, 2026
Forecast Valid:
12am CDT Jun 19, 2026-6pm CDT Jun 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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