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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Granby-Grand County Airport (KGNB)

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

Fair

49°F

9°C

Humidity 91%
Wind Speed SE 6 mph
Barometer 30.39 in
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 18 Sep 8:55 pm MDT
Extended Forecast for

Grand Lake CO

  • Tonight

    Tonight: A 20 percent chance of showers. Partly cloudy, with a low around 35. Light and variable wind.

    Low: 35 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 65. Calm wind becoming southwest 5 to 9 mph in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 60%.

    High: 65 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 30. West southwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 22 mph. Chance of precipitation is 30%.

    Low: 30 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers before noon. Partly sunny, with a high near 60. Light southwest wind becoming west 8 to 13 mph in the morning. Winds could gust as high as 25 mph.

    High: 60 °F

    Chance
    Showers then
    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 28. West wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 21 mph.

    Low: 28 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers before midnight. Mostly cloudy, with a low around 31.

    Low: 31 °F

    Slight Chance
    Showers then
    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers. Partly cloudy, with a low around 35. Light and variable wind.
Saturday
A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 65. Calm wind becoming southwest 5 to 9 mph in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 60%.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 30. West southwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 22 mph. Chance of precipitation is 30%.
Sunday
A 30 percent chance of showers before noon. Partly sunny, with a high near 60. Light southwest wind becoming west 8 to 13 mph in the morning. Winds could gust as high as 25 mph.
Sunday Night
Mostly clear, with a low around 28. West wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 21 mph.
Monday
Sunny, with a high near 66.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 68.
Tuesday Night
A slight chance of showers before midnight. Mostly cloudy, with a low around 31.
Wednesday
A slight chance of showers and thunderstorms after noon. Partly sunny, with a high near 66.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 68.
Thursday Night
A slight chance of showers. Mostly cloudy, with a low around 32.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Lake CO
 40.25°N 105.85°W (Elev. 8599 ft)
Last Update:
12:46 pm MDT Sep 18, 2026
Forecast Valid:
9pm MDT Sep 18, 2026-6pm MDT Sep 25, 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