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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Granby-Grand County Airport (KGNB)

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

Fair

52°F

11°C

Humidity 70%
Wind Speed Calm
Barometer 30.47 in
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 17 Aug 8:35 am MDT
Extended Forecast for

3 Miles ENE Trail Ridge CO

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 61. West wind 7 to 11 mph becoming south southwest in the afternoon. Winds could gust as high as 18 mph.

    High: 61 °F

    Sunny then
    Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 41. West wind 6 to 10 mph, with gusts as high as 16 mph.

    Low: 41 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 63. West southwest wind 6 to 10 mph becoming east in the afternoon. Winds could gust as high as 15 mph.

    High: 63 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 40. East wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 65. West wind 7 to 10 mph becoming east in the afternoon. Winds could gust as high as 18 mph.

    High: 65 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Thursday

    Thursday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 67.

    High: 67 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 61. West wind 7 to 11 mph becoming south southwest in the afternoon. Winds could gust as high as 18 mph.
Tonight
Mostly clear, with a low around 41. West wind 6 to 10 mph, with gusts as high as 16 mph.
Monday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 63. West southwest wind 6 to 10 mph becoming east in the afternoon. Winds could gust as high as 15 mph.
Monday Night
Mostly clear, with a low around 40. East wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.
Tuesday
Sunny, with a high near 65. West wind 7 to 10 mph becoming east in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
Mostly clear, with a low around 40.
Wednesday
Sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 41.
Thursday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 67.
Thursday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 41.
Friday
Showers and thunderstorms likely. Partly sunny, with a high near 62.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 40.
Saturday
Showers and thunderstorms likely. Partly sunny, with a high near 60.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Trail Ridge CO
 40.44°N 105.69°W (Elev. 11752 ft)
Last Update:
7:14 am MDT Aug 17, 2025
Forecast Valid:
9am MDT Aug 17, 2025-6pm MDT Aug 23, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation