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.

A Few Clouds

78°F

26°C

Humidity 68%
Wind Speed S 16 mph
Barometer 29.82 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 15 May 10:15 pm CDT
Extended Forecast for

Collinsville TX

  • Tonight

    Tonight: Mostly cloudy, with a low around 70. South wind around 15 mph, with gusts as high as 20 mph.

    Low: 70 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 88. South wind around 15 mph, with gusts as high as 25 mph.

    High: 88 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 72. South wind around 15 mph, with gusts as high as 25 mph.

    Low: 72 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 88. South wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 88 °F

    Mostly Cloudy

  • Sunday Night

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

    Low: 74 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. South wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 88 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind around 15 mph, with gusts as high as 25 mph.

    Low: 71 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. South wind 10 to 15 mph becoming east in the afternoon. Winds could gust as high as 20 mph.

    High: 81 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. East northeast wind 5 to 10 mph. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 70. South wind around 15 mph, with gusts as high as 20 mph.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 88. South wind around 15 mph, with gusts as high as 25 mph.
Saturday Night
Increasing clouds, with a low around 72. South wind around 15 mph, with gusts as high as 25 mph.
Sunday
Mostly cloudy, with a high near 88. South wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 74. South wind around 15 mph, with gusts as high as 25 mph.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. South wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind around 15 mph, with gusts as high as 25 mph.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. South wind 10 to 15 mph becoming east in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. East northeast wind 5 to 10 mph. Chance of precipitation is 60%.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Collinsville TX
 33.57°N 96.9°W (Elev. 722 ft)
Last Update:
6:11 pm CDT May 15, 2026
Forecast Valid:
10pm CDT May 15, 2026-6pm CDT May 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