National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Granby-Grand County Airport (KGNB)

Lat: 40.09°NLon: 105.92°WElev: 8207ft.

Fair and Breezy

79°F

26°C

Humidity 15%
Wind Speed W 24 G 31 mph
Barometer 30.14 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 16 Jun 4:55 pm MDT
Extended Forecast for

Saint Marys Glacier CO

Red Flag Warning June 17, 12:00pm until June 17, 08:00pm
Click here for hazard details and duration
Red Flag Warning

  • Tonight

    Tonight: Partly cloudy, with a low around 48. Very windy, with a west wind 24 to 29 mph increasing to 32 to 37 mph after midnight. Winds could gust as high as 65 mph.

    Low: 48 °F

    Partly Cloudy
    and Very
    Windy

  • Wednesday

    Wednesday: Sunny, with a high near 68. Very windy, with a west northwest wind 32 to 37 mph decreasing to 26 to 31 mph in the afternoon. Winds could gust as high as 70 mph.

    High: 68 °F

    Sunny and
    Very Windy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 41. Breezy, with a west northwest wind 19 to 24 mph becoming light and variable after midnight. Winds could gust as high as 40 mph.

    Low: 41 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Thursday

    Thursday: Sunny, with a high near 65. Breezy, with a light and variable wind becoming northwest 12 to 17 mph in the morning. Winds could gust as high as 33 mph.

    High: 65 °F

    Sunny then
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 45. Breezy, with a north northwest wind 10 to 15 mph becoming light and variable. Winds could gust as high as 29 mph.

    Low: 45 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Saturday

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

    High: 65 °F

    Breezy. Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 43. Breezy.

    Low: 43 °F

    Mostly Clear
    and Breezy
    then Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 48. Very windy, with a west wind 24 to 29 mph increasing to 32 to 37 mph after midnight. Winds could gust as high as 65 mph.
Wednesday
Sunny, with a high near 68. Very windy, with a west northwest wind 32 to 37 mph decreasing to 26 to 31 mph in the afternoon. Winds could gust as high as 70 mph.
Wednesday Night
Mostly clear, with a low around 41. Breezy, with a west northwest wind 19 to 24 mph becoming light and variable after midnight. Winds could gust as high as 40 mph.
Thursday
Sunny, with a high near 65. Breezy, with a light and variable wind becoming northwest 12 to 17 mph in the morning. Winds could gust as high as 33 mph.
Thursday Night
Mostly clear, with a low around 45. Breezy, with a north northwest wind 10 to 15 mph becoming light and variable. Winds could gust as high as 29 mph.
Juneteenth
Mostly sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 47.
Saturday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 65. Breezy.
Saturday Night
Mostly clear, with a low around 43. Breezy.
Sunday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 62. Breezy.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 41. Breezy.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 61.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 42.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 64.
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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:
12:46 pm MDT Jun 16, 2026
Forecast Valid:
5pm MDT Jun 16, 2026-6pm MDT Jun 23, 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