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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Saint Marys Glacier CO

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a steady temperature around 56. East wind around 6 mph.

    High: 56 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 45. Light and variable wind becoming west 5 to 8 mph in the evening.

    Low: 45 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 64. West northwest wind 6 to 9 mph, with gusts as high as 16 mph.

    High: 64 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 48. Light and variable wind becoming west 5 to 10 mph in the evening. Winds could gust as high as 17 mph.

    Low: 48 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 65. West northwest wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 65 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 48. Chance of precipitation is 20%.

    Low: 48 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 47.

    Low: 47 °F

    Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 65.

    High: 65 °F

    Sunny then
    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a steady temperature around 56. East wind around 6 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 45. Light and variable wind becoming west 5 to 8 mph in the evening.
Monday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 64. West northwest wind 6 to 9 mph, with gusts as high as 16 mph.
Monday Night
Partly cloudy, with a low around 48. Light and variable wind becoming west 5 to 10 mph in the evening. Winds could gust as high as 17 mph.
Tuesday
Mostly sunny, with a high near 65. West northwest wind 10 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 48. Chance of precipitation is 20%.
Wednesday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 62.
Wednesday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 47.
Thursday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 65.
Thursday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 49.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 66.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 50.
Saturday
Showers and possibly a thunderstorm. Partly sunny, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Marys Glacier CO
 39.82°N 105.63°W (Elev. 10735 ft)
Last Update:
1:27 pm MDT Aug 16, 2026
Forecast Valid:
3pm MDT Aug 16, 2026-6pm MDT Aug 22, 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