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

Severe Thunderstorm and Heavy Rainfall Threat Tonight; Heat Continues on Tuesday Across the Eastern U.S.

Severe weather and flash flooding threats continue across the Central Plains and Midwest into tonight. Very large hail, strong tornadoes and damaging winds are expected. An early season heat wave will continue to challenge temperature records across the eastern U.S. through Wednesday. Read More >

Current conditions at

Granby-Grand County Airport (KGNB)

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

Overcast

33°F

1°C

Humidity 90%
Wind Speed Calm
Barometer 30.18 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 18 May 11:55 pm MDT
Extended Forecast for

3 Miles W Arapahoe Peak CO

  • Overnight

    Overnight: A 40 percent chance of snow showers. Mostly cloudy, with a low around 18. West wind around 6 mph. Total nighttime snow accumulation of 1 to 2 inches possible.

    Low: 18 °F

    Chance Snow
    Showers

  • Tuesday

    Tuesday: Snow showers likely, mainly after 3pm. Some thunder is also possible. Increasing clouds, with a high near 30. West southwest wind 5 to 8 mph becoming south southeast in the afternoon. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

    High: 30 °F

    Slight Chance
    Snow Showers
    then Snow
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Snow showers, mainly before 9pm. Low around 20. Southeast wind 6 to 8 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    Low: 20 °F

    Snow Showers
    then Chance
    Snow Showers

  • Wednesday

    Wednesday: Snow showers, mainly after noon. Some thunder is also possible. High near 35. Southwest wind 5 to 9 mph becoming west northwest in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 35 °F

    Chance Snow
    Showers then
    Snow Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow showers before midnight. Some thunder is also possible. Partly cloudy, with a low around 21. West northwest wind 5 to 8 mph becoming south southwest in the evening.

    Low: 21 °F

    Chance Snow
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: Snow showers likely after noon. Some thunder is also possible. Partly sunny, with a high near 39. Chance of precipitation is 60%.

    High: 39 °F

    Mostly Sunny
    then Snow
    Showers
    Likely

  • Thursday Night

    Thursday Night: Snow showers likely, mainly before midnight. Some thunder is also possible. Mostly cloudy, with a low around 23. Chance of precipitation is 60%.

    Low: 23 °F

    Snow Showers
    Likely

  • Friday

    Friday: A chance of snow showers, mainly after noon. Some thunder is also possible. Partly sunny, with a high near 40.

    High: 40 °F

    Chance Snow
    Showers

  • Friday Night

    Friday Night: A slight chance of snow showers before midnight. Some thunder is also possible. Partly cloudy, with a low around 24.

    Low: 24 °F

    Slight Chance
    Snow Showers
    then Partly
    Cloudy

Detailed Forecast

Overnight
A 40 percent chance of snow showers. Mostly cloudy, with a low around 18. West wind around 6 mph. Total nighttime snow accumulation of 1 to 2 inches possible.
Tuesday
Snow showers likely, mainly after 3pm. Some thunder is also possible. Increasing clouds, with a high near 30. West southwest wind 5 to 8 mph becoming south southeast in the afternoon. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.
Tuesday Night
Snow showers, mainly before 9pm. Low around 20. Southeast wind 6 to 8 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Wednesday
Snow showers, mainly after noon. Some thunder is also possible. High near 35. Southwest wind 5 to 9 mph becoming west northwest in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Wednesday Night
A 30 percent chance of snow showers before midnight. Some thunder is also possible. Partly cloudy, with a low around 21. West northwest wind 5 to 8 mph becoming south southwest in the evening.
Thursday
Snow showers likely after noon. Some thunder is also possible. Partly sunny, with a high near 39. Chance of precipitation is 60%.
Thursday Night
Snow showers likely, mainly before midnight. Some thunder is also possible. Mostly cloudy, with a low around 23. Chance of precipitation is 60%.
Friday
A chance of snow showers, mainly after noon. Some thunder is also possible. Partly sunny, with a high near 40.
Friday Night
A slight chance of snow showers before midnight. Some thunder is also possible. Partly cloudy, with a low around 24.
Saturday
A chance of snow showers after noon. Some thunder is also possible. Mostly sunny, with a high near 45.
Saturday Night
Mostly clear, with a low around 28.
Sunday
Sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 32.
Memorial Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 54.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles W Arapahoe Peak CO
 40.02°N 105.71°W (Elev. 11135 ft)
Last Update:
12:46 pm MDT May 18, 2026
Forecast Valid:
12am MDT May 19, 2026-6pm MDT May 25, 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