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

67°F

19°C

Humidity 100%
Wind Speed Calm
Barometer 29.88 in
Dewpoint 67°F (19°C)
Visibility 7.00 mi
Last update 22 May 2:15 am CDT
Extended Forecast for

2 Miles S Knollwood TX

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Patchy fog after 3am. Otherwise, mostly cloudy, with a steady temperature around 66. Calm wind.

    Low: 66 °F

    Slight Chance
    T-storms and
    Patchy Fog

  • Friday

    Friday: Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind becoming west around 5 mph.

    High: 80 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 64. Southeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. North northeast wind around 5 mph becoming south southeast in the morning. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 80 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Southeast wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 80 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. East northeast wind around 5 mph becoming calm.

    Low: 65 °F

    Partly Cloudy

  • Memorial Day

    Memorial Day: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Calm wind becoming east northeast around 5 mph in the afternoon.

    High: 81 °F

    Partly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 65. East northeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Patchy fog after 3am. Otherwise, mostly cloudy, with a steady temperature around 66. Calm wind.
Friday
Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind becoming west around 5 mph.
Friday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 64. Southeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. North northeast wind around 5 mph becoming south southeast in the morning. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Southeast wind around 5 mph becoming calm in the evening.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Calm wind becoming northeast around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 65. East northeast wind around 5 mph becoming calm.
Memorial Day
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Calm wind becoming east northeast around 5 mph in the afternoon.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 65. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Wednesday
Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Knollwood TX
 33.66°N 96.63°W (Elev. 771 ft)
Last Update:
1:26 am CDT May 22, 2026
Forecast Valid:
2am CDT May 22, 2026-6pm CDT May 28, 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