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

47°F

8°C

Humidity 53%
Wind Speed SE 3 mph
Barometer 30.45 in
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 9 Aug 6:35 am MDT
Extended Forecast for

Saint Marys Glacier CO

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Areas of smoke. Partly sunny, with a high near 69. West northwest wind 7 to 14 mph, with gusts as high as 22 mph.

    High: 69 °F

    Areas Smoke
    then Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Areas of smoke. Mostly cloudy, then gradually becoming mostly clear, with a low around 51. West wind 5 to 10 mph, with gusts as high as 16 mph.

    Low: 51 °F

    Slight Chance
    T-storms then
    Areas Smoke

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms after noon. Increasing clouds, with a high near 69. West northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 69 °F

    Sunny then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 51. West wind 6 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    Low: 51 °F

    Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 68. West wind 7 to 11 mph becoming north northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 68 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.

    Low: 50 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Wednesday

    Wednesday: Showers and thunderstorms likely after noon. Mostly cloudy, with a high near 64. Chance of precipitation is 70%.

    High: 64 °F

    Partly Sunny
    then T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers, then showers and thunderstorms after noon. Mostly cloudy, with a high near 59.

    High: 59 °F

    Chance
    Showers then
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Areas of smoke. Partly sunny, with a high near 69. West northwest wind 7 to 14 mph, with gusts as high as 22 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Areas of smoke. Mostly cloudy, then gradually becoming mostly clear, with a low around 51. West wind 5 to 10 mph, with gusts as high as 16 mph.
Monday
A 50 percent chance of showers and thunderstorms after noon. Increasing clouds, with a high near 69. West northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Monday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 51. West wind 6 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Tuesday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 68. West wind 7 to 11 mph becoming north northwest in the afternoon. Winds could gust as high as 21 mph.
Tuesday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.
Wednesday
Showers and thunderstorms likely after noon. Mostly cloudy, with a high near 64. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 46.
Thursday
A chance of showers, then showers and thunderstorms after noon. Mostly cloudy, with a high near 59.
Thursday Night
Showers and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 45.
Friday
Showers and thunderstorms. Mostly cloudy, with a high near 58.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 43.
Saturday
Showers and thunderstorms. Partly sunny, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Marys Glacier CO
 39.82°N 105.63°W (Elev. 10735 ft)
Last Update:
12:46 am MDT Aug 9, 2026
Forecast Valid:
6am MDT Aug 9, 2026-6pm MDT Aug 15, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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