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

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 >

Hazardous Weather Conditions

Current conditions at

Granby-Grand County Airport (KGNB)

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

Fair

55°F

13°C

Humidity 49%
Wind Speed N 5 mph
Barometer 30.17 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 18 Jun 12:55 am MDT
Extended Forecast for

4 Miles WNW LONG'S PEAK CO

Fire Weather Watch June 20, 12:00pm until June 20, 09:00pm
Click here for hazard details and duration
Fire Weather Watch

  • Overnight

    Overnight: Mostly clear, with a low around 35. Southwest wind 8 to 10 mph, with gusts as high as 16 mph.

    Low: 35 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 57. Breezy, with a west wind 10 to 18 mph, with gusts as high as 30 mph.

    High: 57 °F

    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 37. Breezy, with a west wind 7 to 15 mph, with gusts as high as 24 mph.

    Low: 37 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 57. West wind 7 to 13 mph becoming northeast in the afternoon. Winds could gust as high as 24 mph.

    High: 57 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 37. Northeast wind 8 to 11 mph becoming west after midnight. Winds could gust as high as 24 mph.

    Low: 37 °F

    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 57. Windy.

    High: 57 °F

    Sunny and
    Breezy then
    Slight Chance
    T-storms and
    Windy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 35. Windy.

    Low: 35 °F

    Mostly Clear
    and Windy
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny, with a high near 52. Breezy.

    High: 52 °F

    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance
    T-storms then
    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 35. Southwest wind 8 to 10 mph, with gusts as high as 16 mph.
Thursday
Sunny, with a high near 57. Breezy, with a west wind 10 to 18 mph, with gusts as high as 30 mph.
Thursday Night
Mostly clear, with a low around 37. Breezy, with a west wind 7 to 15 mph, with gusts as high as 24 mph.
Juneteenth
Mostly sunny, with a high near 57. West wind 7 to 13 mph becoming northeast in the afternoon. Winds could gust as high as 24 mph.
Friday Night
Partly cloudy, with a low around 37. Northeast wind 8 to 11 mph becoming west after midnight. Winds could gust as high as 24 mph.
Saturday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 57. Windy.
Saturday Night
Mostly clear, with a low around 35. Windy.
Sunday
Sunny, with a high near 52. Breezy.
Sunday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 32.
Monday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 51.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 34.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 54.
Tuesday Night
Partly cloudy, with a low around 36.
Wednesday
Sunny, with a high near 58. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW LONG'S PEAK CO
 40.28°N 105.68°W (Elev. 11834 ft)
Last Update:
12:46 am MDT Jun 18, 2026
Forecast Valid:
1am MDT Jun 18, 2026-6pm MDT Jun 24, 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