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

Fort Collins/Loveland - Northern Colorado Regional Airport (KFNL)

Lat: 40.45°NLon: 105.02°WElev: 5016ft.

Fair

65°F

18°C

Humidity 29%
Wind Speed NE 10 mph
Barometer 30.05 in (1010.6 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 17 Jun 10:56 pm MDT
Extended Forecast for

Johnstown CO

  • Tonight

    Tonight: Mostly clear, with a low around 54. Breezy, with a north northeast wind 12 to 17 mph becoming light east after midnight. Winds could gust as high as 28 mph.

    Low: 54 °F

    Mostly Clear
    and Breezy

  • Thursday

    Thursday: Sunny, with a high near 89. Light east wind becoming east southeast 5 to 9 mph in the morning. Winds could gust as high as 15 mph.

    High: 89 °F

    Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 57. Breezy, with an east wind 8 to 17 mph becoming north northwest after midnight. Winds could gust as high as 31 mph.

    Low: 57 °F

    Mostly Clear
    then
    Increasing
    Clouds and
    Breezy

  • Juneteenth

    Juneteenth: Mostly cloudy, then gradually becoming sunny, with a high near 90. Breezy, with a north wind 10 to 17 mph becoming east in the afternoon. Winds could gust as high as 31 mph.

    High: 90 °F

    Partly Sunny
    and Breezy
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. East wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 18 mph.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 97. Breezy.

    High: 97 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57. Breezy.

    Low: 57 °F

    Partly Cloudy
    and Breezy
    then Mostly
    Clear

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 90. Breezy.

    High: 90 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms and
    Breezy

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 54. Breezy.

    Low: 54 °F

    Chance
    T-storms and
    Breezy then
    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 54. Breezy, with a north northeast wind 12 to 17 mph becoming light east after midnight. Winds could gust as high as 28 mph.
Thursday
Sunny, with a high near 89. Light east wind becoming east southeast 5 to 9 mph in the morning. Winds could gust as high as 15 mph.
Thursday Night
Increasing clouds, with a low around 57. Breezy, with an east wind 8 to 17 mph becoming north northwest after midnight. Winds could gust as high as 31 mph.
Juneteenth
Mostly cloudy, then gradually becoming sunny, with a high near 90. Breezy, with a north wind 10 to 17 mph becoming east in the afternoon. Winds could gust as high as 31 mph.
Friday Night
Mostly clear, with a low around 58. East wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 18 mph.
Saturday
Mostly sunny and hot, with a high near 97. Breezy.
Saturday Night
Mostly clear, with a low around 57. Breezy.
Sunday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 90. Breezy.
Sunday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 54. Breezy.
Monday
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 86.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Tuesday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 56.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Johnstown CO
 40.33°N 104.9°W (Elev. 4783 ft)
Last Update:
12:46 pm MDT Jun 17, 2026
Forecast Valid:
11pm MDT Jun 17, 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