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

33°F

1°C

Humidity 94%
Wind Speed SE 5 mph
Barometer 30.22 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 20 May 11:55 pm MDT
Extended Forecast for

Arapahoe Peak CO

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 17. West southwest wind around 9 mph, with gusts as high as 15 mph.

    Low: 17 °F

    Mostly Clear

  • Thursday

    Thursday: A 50 percent chance of snow showers after noon. Some thunder is also possible. Mostly sunny, with a high near 32. Breezy, with a west wind 10 to 16 mph, with gusts as high as 25 mph. New snow accumulation of less than a half inch possible.

    High: 32 °F

    Mostly Sunny
    then Chance
    Snow Showers
    and Breezy

  • Thursday Night

    Thursday Night: Snow showers likely, mainly before midnight. Some thunder is also possible. Mostly cloudy, with a low around 17. Breezy, with a west wind 14 to 21 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    Low: 17 °F

    Snow Showers
    Likely and
    Breezy

  • Friday

    Friday: A 30 percent chance of snow showers, mainly before noon. Some thunder is also possible. Partly sunny, with a high near 30. Breezy, with a west wind 13 to 22 mph, with gusts as high as 28 mph. New snow accumulation of less than a half inch possible.

    High: 30 °F

    Chance Snow
    Showers and
    Breezy

  • Friday Night

    Friday Night: A 30 percent chance of snow showers, mainly before midnight. Mostly cloudy, with a low around 19. Breezy, with a west wind 10 to 16 mph, with gusts as high as 20 mph.

    Low: 19 °F

    Chance Snow
    Showers and
    Breezy

  • Saturday

    Saturday: A 20 percent chance of snow showers after noon. Some thunder is also possible. Mostly sunny, with a high near 34. Breezy.

    High: 34 °F

    Breezy.
    Mostly Sunny
    then Slight
    Chance Snow
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 22. Breezy.

    Low: 22 °F

    Mostly Clear
    and Breezy

  • Sunday

    Sunday: Sunny, with a high near 42. Breezy.

    High: 42 °F

    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 17. West southwest wind around 9 mph, with gusts as high as 15 mph.
Thursday
A 50 percent chance of snow showers after noon. Some thunder is also possible. Mostly sunny, with a high near 32. Breezy, with a west wind 10 to 16 mph, with gusts as high as 25 mph. New snow accumulation of less than a half inch possible.
Thursday Night
Snow showers likely, mainly before midnight. Some thunder is also possible. Mostly cloudy, with a low around 17. Breezy, with a west wind 14 to 21 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Friday
A 30 percent chance of snow showers, mainly before noon. Some thunder is also possible. Partly sunny, with a high near 30. Breezy, with a west wind 13 to 22 mph, with gusts as high as 28 mph. New snow accumulation of less than a half inch possible.
Friday Night
A 30 percent chance of snow showers, mainly before midnight. Mostly cloudy, with a low around 19. Breezy, with a west wind 10 to 16 mph, with gusts as high as 20 mph.
Saturday
A 20 percent chance of snow showers after noon. Some thunder is also possible. Mostly sunny, with a high near 34. Breezy.
Saturday Night
Mostly clear, with a low around 22. Breezy.
Sunday
Sunny, with a high near 42. Breezy.
Sunday Night
Mostly clear, with a low around 29.
Memorial Day
A chance of snow showers after noon. Some thunder is also possible. Mostly sunny, with a high near 45.
Monday Night
A slight chance of snow showers. Some thunder is also possible. Partly cloudy, with a low around 31. Breezy.
Tuesday
Snow showers likely. Some thunder is also possible. Partly sunny, with a high near 43. Breezy.
Tuesday Night
A chance of snow showers. Some thunder is also possible. Mostly cloudy, with a low around 29. Breezy.
Wednesday
A chance of snow showers. Some thunder is also possible. Partly sunny, with a high near 41. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Arapahoe Peak CO
 40.02°N 105.65°W (Elev. 12680 ft)
Last Update:
12:46 pm MDT May 20, 2026
Forecast Valid:
12am MDT May 21, 2026-6pm MDT May 27, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation