National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

63°F

17°C

Humidity 85%
Wind Speed S 10 mph
Barometer 30.16 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 25 Dec 12:35 am CST
Extended Forecast for

Grayson County Airport TX

  • Overnight

    Overnight: Partly cloudy, with a low around 60. South southwest wind around 10 mph.

    Low: 60 °F

    Partly Cloudy

  • Christmas Day

    Christmas Day: Mostly sunny, with a high near 79. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 79 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 63. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 81. Southwest wind 5 to 15 mph.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61. South southwest wind 5 to 10 mph.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 79. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 64. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 71. South southwest wind 15 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 71 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 30. North wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 30 °F

    Slight Chance
    Showers then
    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 60. South southwest wind around 10 mph.
Christmas Day
Mostly sunny, with a high near 79. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 63. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 81. Southwest wind 5 to 15 mph.
Friday Night
Mostly clear, with a low around 61. South southwest wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 79. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 64. South wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
Mostly cloudy, with a high near 71. South southwest wind 15 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 30. North wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
Partly sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 25.
Tuesday
Sunny, with a high near 49.
Tuesday Night
Mostly clear, with a low around 32.
Wednesday
Sunny, with a high near 57.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayson County Airport TX
 33.71°N 96.66°W (Elev. 797 ft)
Last Update:
11:21 pm CST Dec 24, 2025
Forecast Valid:
12am CST Dec 25, 2025-6pm CST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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