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.

Overcast

61°F

16°C

Humidity 43%
Wind Speed NE 5 mph
Barometer 30.41 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 10 Aug 1:15 am MDT
Extended Forecast for

3 Miles W Saint Marys Glacier CO

  • Overnight

    Overnight: Areas of smoke. Mostly cloudy, with a steady temperature around 48. West wind 9 to 11 mph, with gusts as high as 18 mph.

    Low: 48 °F

    Areas Smoke

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 60. Northwest wind 11 to 14 mph, with gusts as high as 22 mph.

    High: 60 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 45. West northwest wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    Low: 45 °F

    Chance
    Showers then
    Mostly Clear

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after noon. Increasing clouds, with a high near 60. West northwest wind 11 to 14 mph, with gusts as high as 23 mph.

    High: 60 °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 45. Northwest wind 8 to 11 mph becoming west southwest in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 30%.

    Low: 45 °F

    Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm after noon. High near 57. Chance of precipitation is 90%.

    High: 57 °F

    Partly Sunny
    then T-storms

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 42. Chance of precipitation is 70%.

    Low: 42 °F

    Showers
    Likely then
    Chance
    Showers

  • Thursday

    Thursday: Showers likely, then showers and thunderstorms after noon. Cloudy, with a high near 50.

    High: 50 °F

    Showers
    Likely then
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 40.

    Low: 40 °F

    Showers

Detailed Forecast

Overnight
Areas of smoke. Mostly cloudy, with a steady temperature around 48. West wind 9 to 11 mph, with gusts as high as 18 mph.
Monday
A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 60. Northwest wind 11 to 14 mph, with gusts as high as 22 mph.
Monday Night
A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 45. West northwest wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Tuesday
A 40 percent chance of showers and thunderstorms after noon. Increasing clouds, with a high near 60. West northwest wind 11 to 14 mph, with gusts as high as 23 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 45. Northwest wind 8 to 11 mph becoming west southwest in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 30%.
Wednesday
Showers and possibly a thunderstorm after noon. High near 57. Chance of precipitation is 90%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 42. Chance of precipitation is 70%.
Thursday
Showers likely, then showers and thunderstorms after noon. Cloudy, with a high near 50.
Thursday Night
Showers and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 40.
Friday
A chance of showers, then showers and thunderstorms after noon. Mostly cloudy, with a high near 52.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 39.
Saturday
Showers and possibly a thunderstorm. Partly sunny, with a high near 52.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 39.
Sunday
Showers and thunderstorms likely. Partly sunny, with a high near 54.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles W Saint Marys Glacier CO
 39.84°N 105.69°W (Elev. 12507 ft)
Last Update:
12:46 am MDT Aug 10, 2026
Forecast Valid:
1am MDT Aug 10, 2026-6pm MDT Aug 16, 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