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.

Mostly Cloudy

48°F

9°C

Humidity 95%
Wind Speed SE 3 mph
Barometer 30.36 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 30 Aug 4:15 am MDT
Extended Forecast for

11 Miles SSE Williams Fork Reservoir CO

  • Overnight

    Overnight: A 20 percent chance of showers after 5am. Mostly cloudy, with a low around 49. South wind around 5 mph.

    Low: 49 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 68. West wind 5 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    High: 68 °F

    Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Mostly cloudy, with a low around 48. West southwest wind 5 to 9 mph becoming light and variable in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 20%.

    Low: 48 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: Showers and thunderstorms likely, mainly before 3pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 68. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 68 °F

    Partly Sunny
    then Showers
    Likely

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 47. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 47 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 69. Chance of precipitation is 20%.

    High: 69 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers after 5am. Mostly cloudy, with a low around 49. South wind around 5 mph.
Sunday
A chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 68. West wind 5 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Sunday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Mostly cloudy, with a low around 48. West southwest wind 5 to 9 mph becoming light and variable in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 20%.
Monday
Showers and thunderstorms likely, mainly before 3pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 68. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 70%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 47. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Tuesday
A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 69. Chance of precipitation is 20%.
Tuesday Night
Mostly clear, with a low around 44.
Wednesday
Sunny, with a high near 71.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 73.
Thursday Night
Partly cloudy, with a low around 46.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 73.
Friday Night
Mostly cloudy, with a low around 48.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 74.
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ABOUT THIS FORECAST

 
Point Forecast:
11 Miles SSE Williams Fork Reservoir CO
 39.9°N 106.1°W (Elev. 8573 ft)
Last Update:
12:46 am MDT Aug 30, 2026
Forecast Valid:
4am MDT Aug 30, 2026-6pm MDT Sep 5, 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