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

46°F

8°C

Humidity 62%
Wind Speed Calm
Barometer 30.22 in
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 18 Jun 7:15 am MDT
Extended Forecast for

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

  • Today

    Today: Sunny, with a high near 58. Breezy, with a west wind 11 to 17 mph, with gusts as high as 28 mph.

    High: 58 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Partly cloudy, with a low around 40. Breezy, with a west wind 8 to 16 mph, with gusts as high as 25 mph.

    Low: 40 °F

    Partly Cloudy
    and Breezy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 56. West wind 7 to 14 mph becoming east in the afternoon. Winds could gust as high as 25 mph.

    High: 56 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 39. East southeast wind 8 to 14 mph becoming west northwest after midnight. Winds could gust as high as 25 mph.

    Low: 39 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 57. Very windy, with a west wind 14 to 24 mph increasing to 29 to 39 mph. Winds could gust as high as 48 mph.

    High: 57 °F

    Sunny and
    Breezy then
    Slight Chance
    T-storms and
    Very Windy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 37. Very windy.

    Low: 37 °F

    Mostly Clear
    and Very
    Windy

  • Sunday

    Sunday: A slight chance of rain and snow showers after noon. Some thunder is also possible. Sunny, with a high near 52. Windy. Chance of precipitation is 20%.

    High: 52 °F

    Windy. Sunny
    then Slight
    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 34. Breezy.

    Low: 34 °F

    Chance
    T-storms and
    Breezy then
    Mostly Cloudy

  • Monday

    Monday: A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 50.

    High: 50 °F

    Sunny then
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 58. Breezy, with a west wind 11 to 17 mph, with gusts as high as 28 mph.
Tonight
Partly cloudy, with a low around 40. Breezy, with a west wind 8 to 16 mph, with gusts as high as 25 mph.
Juneteenth
Mostly sunny, with a high near 56. West wind 7 to 14 mph becoming east in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 39. East southeast wind 8 to 14 mph becoming west northwest after midnight. Winds could gust as high as 25 mph.
Saturday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 57. Very windy, with a west wind 14 to 24 mph increasing to 29 to 39 mph. Winds could gust as high as 48 mph.
Saturday Night
Mostly clear, with a low around 37. Very windy.
Sunday
A slight chance of rain and snow showers after noon. Some thunder is also possible. Sunny, with a high near 52. Windy. Chance of precipitation is 20%.
Sunday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 34. Breezy.
Monday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 50.
Monday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 36.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 53.
Tuesday Night
Partly cloudy, with a low around 38.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 58. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
LONG'S PEAK CO
 40.24°N 105.62°W (Elev. 12064 ft)
Last Update:
12:46 am MDT Jun 18, 2026
Forecast Valid:
7am MDT Jun 18, 2026-6pm MDT Jun 24, 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