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

Heavy Rainfall in the Southern Plains and Mississippi Valley; Thunderstorms in Eastern Colorado on Thursday

A multiple day heavy rainfall event will begin to set up from the Southern Plains into the Mississippi Valley Thursday, peaking in intensity over the holiday weekend. Widely scattered thunderstorms are expected to develop across eastern Colorado Thursday afternoon and evening. Large hail will be the primary hazard. Read More >

Current conditions at

Granby-Grand County Airport (KGNB)

Lat: 40.09°NLon: 105.92°WElev: 8207ft.

Fair

30°F

-1°C

Humidity 95%
Wind Speed SE 3 mph
Barometer 30.18 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 21 May 3:55 am MDT
Extended Forecast for

4 Miles NNW LONG'S PEAK CO

  • Today

    Today: A chance of snow showers after 9am, mixing with rain after 3pm. Some thunder is also possible. Partly sunny, with a high near 47. West southwest wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.

    High: 47 °F

    Slight Chance
    Snow Showers
    then Chance
    Rain/Snow

  • Tonight

    Tonight: Snow showers likely, possibly mixed with rain, becoming all snow after 9pm. Some thunder is also possible. Mostly cloudy, with a low around 29. West wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Rain/Snow
    Likely then
    Chance Snow
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 46. West wind 7 to 13 mph, with gusts as high as 23 mph.

    High: 46 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of snow showers. Mostly cloudy, with a low around 30. Light south southwest wind becoming west 5 to 9 mph after midnight. Winds could gust as high as 17 mph. Little or no snow accumulation expected.

    Low: 30 °F

    Chance Snow
    Showers

  • Saturday

    Saturday: A chance of snow showers before 3pm, then a chance of rain and snow showers. Some thunder is also possible. Mostly sunny, with a high near 50. Breezy, with a west wind 10 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.

    High: 50 °F

    Slight Chance
    Snow Showers
    then Chance
    Rain/Snow and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 33. Breezy.

    Low: 33 °F

    Mostly Clear
    then Clear
    and Breezy

  • Sunday

    Sunday: Sunny, with a high near 59. Breezy.

    High: 59 °F

    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

  • Memorial Day

    Memorial Day: A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 62.

    High: 62 °F

    Sunny then
    Chance
    T-storms

Detailed Forecast

Today
A chance of snow showers after 9am, mixing with rain after 3pm. Some thunder is also possible. Partly sunny, with a high near 47. West southwest wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.
Tonight
Snow showers likely, possibly mixed with rain, becoming all snow after 9pm. Some thunder is also possible. Mostly cloudy, with a low around 29. West wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Friday
Mostly sunny, with a high near 46. West wind 7 to 13 mph, with gusts as high as 23 mph.
Friday Night
A 40 percent chance of snow showers. Mostly cloudy, with a low around 30. Light south southwest wind becoming west 5 to 9 mph after midnight. Winds could gust as high as 17 mph. Little or no snow accumulation expected.
Saturday
A chance of snow showers before 3pm, then a chance of rain and snow showers. Some thunder is also possible. Mostly sunny, with a high near 50. Breezy, with a west wind 10 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.
Saturday Night
Mostly clear, with a low around 33. Breezy.
Sunday
Sunny, with a high near 59. Breezy.
Sunday Night
Partly cloudy, with a low around 36.
Memorial Day
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 62.
Monday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 38.
Tuesday
Showers and possibly a thunderstorm. Partly sunny, with a high near 58.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 36.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW LONG'S PEAK CO
 40.31°N 105.65°W (Elev. 10000 ft)
Last Update:
12:46 am MDT May 21, 2026
Forecast Valid:
4am MDT May 21, 2026-6pm MDT May 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation