Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Current conditions at

Granby-Grand County Airport (KGNB)

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

Fair

59°F

15°C

Humidity 45%
Wind Speed E 3 mph
Barometer 30.16 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 18 Jun 12:15 am MDT
Extended Forecast for

Grand Lake CO

  • Overnight

    Overnight: Clear, with a low around 41. South wind 3 to 6 mph.

    Low: 41 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 77. Breezy, with a light and variable wind becoming west northwest 10 to 15 mph in the morning. Winds could gust as high as 24 mph.

    High: 77 °F

    Sunny then
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 43. West northwest wind 9 to 14 mph becoming light and variable  after midnight. Winds could gust as high as 23 mph.

    Low: 43 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Sunny, with a high near 79. Light and variable wind becoming west northwest 8 to 13 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 79 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 45. West northwest wind 5 to 8 mph becoming light and variable  after midnight. Winds could gust as high as 18 mph.

    Low: 45 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 78. Breezy.

    High: 78 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 42. Breezy.

    Low: 42 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny, with a high near 73. Breezy.

    High: 73 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before midnight.  Partly cloudy, with a low around 41.

    Low: 41 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 41. South wind 3 to 6 mph.
Thursday
Sunny, with a high near 77. Breezy, with a light and variable wind becoming west northwest 10 to 15 mph in the morning. Winds could gust as high as 24 mph.
Thursday Night
Mostly clear, with a low around 43. West northwest wind 9 to 14 mph becoming light and variable after midnight. Winds could gust as high as 23 mph.
Juneteenth
Sunny, with a high near 79. Light and variable wind becoming west northwest 8 to 13 mph in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Partly cloudy, with a low around 45. West northwest wind 5 to 8 mph becoming light and variable after midnight. Winds could gust as high as 18 mph.
Saturday
Sunny, with a high near 78. Breezy.
Saturday Night
Mostly clear, with a low around 42. Breezy.
Sunday
Sunny, with a high near 73. Breezy.
Sunday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 41.
Monday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 79. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Lake CO
 40.23°N 105.82°W (Elev. 9199 ft)
12:46 pm MDT Jun 17, 2026
12am MDT Jun 18, 2026-6pm MDT Jun 24, 2026
 
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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