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

63°F

17°C

Humidity 48%
Wind Speed Calm
Barometer 30.57 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 26 Aug 10:15 am MDT
Extended Forecast for

Saint Marys Glacier CO

  • Today

    Today: A chance of showers and thunderstorms between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. Increasing clouds, with a high near 63. West northwest wind 5 to 7 mph becoming east northeast in the afternoon. Chance of precipitation is 60%.

    High: 63 °F

    Mostly Sunny
    then Showers
    Likely

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 46. Northeast wind 6 to 8 mph becoming west southwest in the evening.

    Low: 46 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly between noon and 3pm. Mostly sunny, with a high near 66. West wind 7 to 11 mph becoming east in the afternoon. Winds could gust as high as 21 mph.

    High: 66 °F

    Mostly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 48. South southeast wind 5 to 11 mph becoming west after midnight. Winds could gust as high as 21 mph.

    Low: 48 °F

    Partly Cloudy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 66. West northwest wind 8 to 14 mph, with gusts as high as 25 mph.

    High: 66 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 65. Breezy.

    High: 65 °F

    Breezy.
    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms likely after noon. Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny
    then T-storms
    Likely

Detailed Forecast

Today
A chance of showers and thunderstorms between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. Increasing clouds, with a high near 63. West northwest wind 5 to 7 mph becoming east northeast in the afternoon. Chance of precipitation is 60%.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 46. Northeast wind 6 to 8 mph becoming west southwest in the evening.
Thursday
A 30 percent chance of showers and thunderstorms, mainly between noon and 3pm. Mostly sunny, with a high near 66. West wind 7 to 11 mph becoming east in the afternoon. Winds could gust as high as 21 mph.
Thursday Night
Partly cloudy, with a low around 48. South southeast wind 5 to 11 mph becoming west after midnight. Winds could gust as high as 21 mph.
Friday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 66. West northwest wind 8 to 14 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 50.
Saturday
A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 65. Breezy.
Saturday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 48.
Sunday
Showers and thunderstorms likely after noon. Partly sunny, with a high near 61.
Sunday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 44.
Monday
Showers and thunderstorms likely. Partly sunny, with a high near 60.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 44.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Marys Glacier CO
 39.82°N 105.63°W (Elev. 10735 ft)
Last Update:
6:04 am MDT Aug 26, 2026
Forecast Valid:
10am MDT Aug 26, 2026-6pm MDT Sep 1, 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