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.

Fair

52°F

11°C

Humidity 60%
Wind Speed Calm
Barometer 30.52 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 28 Aug 8:15 am MDT
Extended Forecast for

3 Miles WNW Saint Marys Glacier CO

  • Today

    Today: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 60. Breezy, with a west wind 14 to 16 mph, with gusts as high as 25 mph.

    High: 60 °F

    Breezy.
    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 45. West southwest wind 11 to 14 mph, with gusts as high as 22 mph.

    Low: 45 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 57. Breezy, with a west wind 14 to 21 mph, with gusts as high as 33 mph.

    High: 57 °F

    Breezy.
    Mostly Cloudy
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 44. Breezy, with a west southwest wind 14 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.

    Low: 44 °F

    Chance
    T-storms and
    Breezy then
    Mostly Cloudy

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 54. Breezy, with a west wind 15 to 21 mph, with gusts as high as 36 mph.

    High: 54 °F

    Breezy.
    Mostly Cloudy
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 41. Breezy. Chance of precipitation is 20%.

    Low: 41 °F

    Slight Chance
    T-storms and
    Breezy then
    Mostly Cloudy

  • Monday

    Monday: Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 52. Chance of precipitation is 70%.

    High: 52 °F

    Partly Sunny
    then Showers
    Likely

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 39.

    Low: 39 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 53.

    High: 53 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 60. Breezy, with a west wind 14 to 16 mph, with gusts as high as 25 mph.
Tonight
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 45. West southwest wind 11 to 14 mph, with gusts as high as 22 mph.
Saturday
A 30 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 57. Breezy, with a west wind 14 to 21 mph, with gusts as high as 33 mph.
Saturday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 44. Breezy, with a west southwest wind 14 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Sunday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 54. Breezy, with a west wind 15 to 21 mph, with gusts as high as 36 mph.
Sunday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 41. Breezy. Chance of precipitation is 20%.
Monday
Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 52. Chance of precipitation is 70%.
Monday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 39.
Tuesday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 53.
Tuesday Night
Partly cloudy, with a low around 39.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 53. Breezy.
Wednesday Night
Partly cloudy, with a low around 40.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 54. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Saint Marys Glacier CO
 39.84°N 105.69°W (Elev. 12507 ft)
Last Update:
12:46 am MDT Aug 28, 2026
Forecast Valid:
8am MDT Aug 28, 2026-6pm MDT Sep 3, 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