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

73°F

23°C

Humidity 95%
Wind Speed E 5 mph
Barometer 29.95 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 15 Jun 10:15 pm CDT
Extended Forecast for

Collinsville TX

  • Tonight

    Tonight: Mostly cloudy, with a low around 68. East northeast wind around 5 mph becoming calm.

    Low: 68 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. Calm wind becoming east southeast around 5 mph.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Clear, then becoming mostly cloudy toward daybreak, with a low around 72. South wind around 5 mph.

    Low: 72 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 90. Heat index values as high as 99. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 90 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 75. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 91. South southeast wind around 10 mph.

    High: 91 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Northeast wind 5 to 10 mph.

    Low: 72 °F

    Chance
    T-storms

  • Juneteenth

    Juneteenth: A 40 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 87. East northeast wind around 10 mph.

    High: 87 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. East wind 5 to 10 mph.

    Low: 72 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Mostly cloudy, with a low around 68. East northeast wind around 5 mph becoming calm.
Tuesday
Mostly sunny, with a high near 86. Calm wind becoming east southeast around 5 mph.
Tuesday Night
Clear, then becoming mostly cloudy toward daybreak, with a low around 72. South wind around 5 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 90. Heat index values as high as 99. South wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 75. South wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 91. South southeast wind around 10 mph.
Thursday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Northeast wind 5 to 10 mph.
Juneteenth
A 40 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 87. East northeast wind around 10 mph.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. East wind 5 to 10 mph.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 78.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Collinsville TX
 33.57°N 96.9°W (Elev. 722 ft)
Last Update:
7:06 pm CDT Jun 15, 2026
Forecast Valid:
10pm CDT Jun 15, 2026-6pm CDT Jun 22, 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