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

Granby-Grand County Airport (KGNB)

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

Overcast

63°F

17°C

Humidity 50%
Wind Speed Calm
Barometer 30.49 in
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 11 Aug 9:55 am MDT
Extended Forecast for

4 Miles WSW Arapahoe Peak CO

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Patchy smoke. Partly sunny, with a high near 66. West northwest wind 5 to 8 mph becoming east northeast in the afternoon.

    High: 66 °F

    Patchy Smoke
    then Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 9pm. Patchy smoke between 3am and 5am. Mostly cloudy, then gradually becoming mostly clear, with a low around 49. East wind around 6 mph becoming light and variable after midnight.

    Low: 49 °F

    Chance
    T-storms then
    Patchy Smoke

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly after 3pm. Patchy smoke between 2pm and 4pm. Increasing clouds, with a high near 64. Calm wind becoming west northwest 5 to 8 mph in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 70%.

    High: 64 °F

    Patchy Smoke
    then T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Cloudy, then gradually becoming partly cloudy, with a low around 45. West wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 70%.

    Low: 45 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Thursday

    Thursday: A chance of showers before noon, then showers and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms after 3pm. High near 59. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 90%.

    High: 59 °F

    Chance
    Showers then
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 44. Chance of precipitation is 80%.

    Low: 44 °F

    Showers then
    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers, then showers and thunderstorms after noon. High near 58. Chance of precipitation is 90%.

    High: 58 °F

    Slight Chance
    Showers then
    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 43.

    Low: 43 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers and thunderstorms likely after noon. Partly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny
    then T-storms
    Likely

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Patchy smoke. Partly sunny, with a high near 66. West northwest wind 5 to 8 mph becoming east northeast in the afternoon.
Tonight
A 30 percent chance of showers and thunderstorms before 9pm. Patchy smoke between 3am and 5am. Mostly cloudy, then gradually becoming mostly clear, with a low around 49. East wind around 6 mph becoming light and variable after midnight.
Wednesday
Showers and thunderstorms likely, mainly after 3pm. Patchy smoke between 2pm and 4pm. Increasing clouds, with a high near 64. Calm wind becoming west northwest 5 to 8 mph in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Cloudy, then gradually becoming partly cloudy, with a low around 45. West wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 70%.
Thursday
A chance of showers before noon, then showers and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms after 3pm. High near 59. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 90%.
Thursday Night
Showers and possibly a thunderstorm. Low around 44. Chance of precipitation is 80%.
Friday
A slight chance of showers, then showers and thunderstorms after noon. High near 58. Chance of precipitation is 90%.
Friday Night
Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 43.
Saturday
Showers and thunderstorms likely after noon. Partly sunny, with a high near 58.
Saturday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 43.
Sunday
Showers and thunderstorms likely. Partly sunny, with a high near 60.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 43.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Arapahoe Peak CO
 40.02°N 105.71°W (Elev. 11135 ft)
Last Update:
12:46 am MDT Aug 11, 2026
Forecast Valid:
10am MDT Aug 11, 2026-6pm MDT Aug 17, 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