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

49°F

9°C

Humidity	60%
Wind Speed	SE 3 mph
Barometer	30.18 in
Dewpoint	35°F (2°C)
Visibility	10.00 mi
Last update	18 Jun 2:55 am MDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

4 Miles NW 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
Low: 44 °F
Clear
Thursday
High: 71 °F
Sunny and
Breezy
Thursday Night
Low: 47 °F
Mostly Clear
Juneteenth
High: 73 °F
Mostly Sunny
Friday Night
Low: 47 °F
Partly Cloudy
Saturday
High: 73 °F
Sunny and
Breezy then
Slight Chance
T-storms and
Windy
Saturday Night
Low: 46 °F
Mostly Clear
and Windy
Sunday
High: 67 °F
Sunny and
Breezy
Sunday Night
Low: 42 °F
Chance
T-storms then
Mostly Cloudy

Detailed Forecast

Overnight

Clear, with a steady temperature around 44. Southwest wind around 6 mph.

Thursday

Sunny, with a high near 71. Breezy, with a west wind 7 to 16 mph, with gusts as high as 25 mph.

Thursday Night

Mostly clear, with a low around 47. West wind 5 to 11 mph, with gusts as high as 18 mph.

Juneteenth

Mostly sunny, with a high near 73. West southwest wind 6 to 10 mph becoming east northeast in the afternoon. Winds could gust as high as 22 mph.

Friday Night

Partly cloudy, with a low around 47. East wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 22 mph.

Saturday

A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 73. Windy.

Saturday Night

Mostly clear, with a low around 46. Windy.

Sunday

Sunny, with a high near 67. Breezy.

Sunday Night

A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 42.

Monday

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

Monday Night

A slight chance of showers and thunderstorms. Partly cloudy, with a low around 44.

Tuesday

A slight chance of showers and thunderstorms. Sunny, with a high near 68.

Tuesday Night

Partly cloudy, with a low around 46.

Wednesday

Sunny, with a high near 73. Breezy.

Additional Forecasts and Information

Zone Area Forecast for South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet, CO

Basemap Options

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ABOUT THIS FORECAST

Point Forecast:

4 Miles NW LONG'S PEAK CO
40.31°N 105.65°W (Elev. 10000 ft)

12:46 am MDT Jun 18, 2026

Forecast Valid:

3am MDT Jun 18, 2026-6pm MDT Jun 24, 2026

Forecast Discussion

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