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

65°F

18°C

Humidity 52%
Wind Speed NW 5 mph
Barometer 30.53 in
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 15 Aug 10:55 am MDT
Extended Forecast for

Saint Marys Glacier CO

  • Today

    Today: A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 3pm, then showers and thunderstorms likely after 3pm. Mostly cloudy, with a high near 55. West southwest wind 5 to 7 mph. Chance of precipitation is 70%.

    High: 55 °F

    T-storms
    Likely

  • Tonight

    Tonight: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and 10pm. Partly cloudy, with a low around 45. West northwest wind 5 to 8 mph becoming south in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 50%.

    Low: 45 °F

    Chance
    T-storms then
    Mostly Clear

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 59. West wind 5 to 9 mph becoming east in the afternoon. Winds could gust as high as 17 mph.

    High: 59 °F

    Sunny then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 45. North northeast wind 6 to 13 mph becoming west southwest in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 30%.

    Low: 45 °F

    Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 60. West wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 60 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 47. Breezy.

    Low: 47 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Tuesday

    Tuesday: Partly sunny, with a high near 61. Breezy.

    High: 61 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers, then showers and thunderstorms likely after noon. Partly sunny, with a high near 61.

    High: 61 °F

    Slight Chance
    Showers then
    T-storms
    Likely

Detailed Forecast

Today
A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 3pm, then showers and thunderstorms likely after 3pm. Mostly cloudy, with a high near 55. West southwest wind 5 to 7 mph. Chance of precipitation is 70%.
Tonight
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and 10pm. Partly cloudy, with a low around 45. West northwest wind 5 to 8 mph becoming south in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 50%.
Sunday
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 59. West wind 5 to 9 mph becoming east in the afternoon. Winds could gust as high as 17 mph.
Sunday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 45. North northeast wind 6 to 13 mph becoming west southwest in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Monday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 60. West wind 6 to 13 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 47. Breezy.
Tuesday
Partly sunny, with a high near 61. Breezy.
Tuesday Night
A slight chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 47.
Wednesday
A slight chance of showers, then showers and thunderstorms likely after noon. Partly sunny, with a high near 61.
Wednesday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 47.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 63. Breezy.
Thursday Night
Partly cloudy, with a low around 48. Breezy.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 64. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Marys Glacier CO
 39.85°N 105.63°W (Elev. 11368 ft)
Last Update:
12:46 am MDT Aug 15, 2026
Forecast Valid:
11am MDT Aug 15, 2026-6pm MDT Aug 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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