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.

Thunderstorm Light Rain in Vicinity

57°F

14°C

Humidity 89%
Wind Speed NW 20 G 24 mph
Barometer 30.29 in
Dewpoint 54°F (12°C)
Visibility 7.00 mi
Last update 12 Aug 6:35 pm MDT
Extended Forecast for

Saint Marys Glacier CO

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before 9pm, then a chance of showers between 9pm and midnight. Cloudy, then gradually becoming partly cloudy, with a low around 47. West wind 7 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 70%.

    Low: 47 °F

    Showers
    Likely then
    Partly Cloudy

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly after noon. High near 60. West wind 5 to 7 mph becoming light and variable. Chance of precipitation is 80%.

    High: 60 °F

    Chance
    Showers then
    T-storms

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 9pm, then a chance of showers and thunderstorms between 9pm and midnight. Mostly cloudy, with a low around 46. Light west southwest wind becoming west 5 to 9 mph in the evening. Winds could gust as high as 18 mph. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely then
    Partly Cloudy

  • Friday

    Friday: A chance of showers, then showers and possibly a thunderstorm after noon. High near 60. West wind 5 to 9 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%.

    High: 60 °F

    Chance
    Showers then
    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 9pm, then showers likely between 9pm and midnight. Mostly cloudy, with a low around 45. West wind 5 to 8 mph, with gusts as high as 16 mph. Chance of precipitation is 70%.

    Low: 45 °F

    Showers
    Likely then
    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers, then showers and thunderstorms after 9am. High near 58. Chance of precipitation is 80%.

    High: 58 °F

    Chance
    Showers then
    T-storms

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 44. Chance of precipitation is 70%.

    Low: 44 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Sunday

    Sunday: A chance of showers, then showers and possibly a thunderstorm after noon. Mostly cloudy, with a high near 58.

    High: 58 °F

    Chance
    Showers then
    T-storms

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 43.

    Low: 43 °F

    Showers
    Likely

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm before 9pm, then a chance of showers between 9pm and midnight. Cloudy, then gradually becoming partly cloudy, with a low around 47. West wind 7 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm, mainly after noon. High near 60. West wind 5 to 7 mph becoming light and variable. Chance of precipitation is 80%.
Thursday Night
Showers likely and possibly a thunderstorm before 9pm, then a chance of showers and thunderstorms between 9pm and midnight. Mostly cloudy, with a low around 46. Light west southwest wind becoming west 5 to 9 mph in the evening. Winds could gust as high as 18 mph. Chance of precipitation is 70%.
Friday
A chance of showers, then showers and possibly a thunderstorm after noon. High near 60. West wind 5 to 9 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%.
Friday Night
Showers likely and possibly a thunderstorm before 9pm, then showers likely between 9pm and midnight. Mostly cloudy, with a low around 45. West wind 5 to 8 mph, with gusts as high as 16 mph. Chance of precipitation is 70%.
Saturday
A chance of showers, then showers and thunderstorms after 9am. High near 58. Chance of precipitation is 80%.
Saturday Night
Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 44. Chance of precipitation is 70%.
Sunday
A chance of showers, then showers and possibly a thunderstorm after noon. Mostly cloudy, with a high near 58.
Sunday Night
Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 43.
Monday
Showers and thunderstorms likely after noon. 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 63.
Tuesday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 46.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 64.
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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 pm MDT Aug 12, 2026
Forecast Valid:
6pm MDT Aug 12, 2026-6pm MDT Aug 19, 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