Tracking Major Hurricane Erin; Hot in the Mid-Mississippi Valley

Major Hurricane Erin is tracking just north of the lower Bahamas today. Dangerous surf and rip current threats increase this week for most of the Atlantic coastline. Erin's outerbands may impact the Outer Banks later this week. Hot to extremely hot temperatures are forecast today and Tuesday from a part of the southern Plains into the central to lower Mississippi River Valley. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Granby-Grand County Airport (KGNB)

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

Fair

82°F

28°C

Humidity	14%
Wind Speed	NW 15 G 22 mph
Barometer	30.44 in
Dewpoint	28°F (-2°C)
Visibility	10.00 mi
Heat Index	80°F (27°C)
Last update	18 Aug 1:15 pm MDT

More Information:

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

Extended Forecast for

10 Miles NNE Silverthorne CO

This Afternoon
High: 77 °F
Mostly Sunny
Tonight
Low: 44 °F
Mostly Clear
Tuesday
High: 80 °F
Sunny
Tuesday Night
Low: 43 °F
Mostly Clear
Wednesday
High: 82 °F
Sunny
Wednesday Night
Low: 45 °F
Mostly Clear
Thursday
High: 83 °F
Sunny
Thursday Night
Low: 46 °F
Slight Chance
Showers then
Partly Cloudy
Friday
High: 79 °F
Mostly Sunny
then T-storms
Likely

Detailed Forecast

This Afternoon

Mostly sunny, with a high near 77. West northwest wind around 6 mph.

Tonight

Mostly clear, with a low around 44. Northwest wind around 6 mph becoming light and variable after midnight.

Tuesday

Sunny, with a high near 80. Calm wind becoming east northeast 5 to 7 mph in the afternoon. Winds could gust as high as 16 mph.

Tuesday Night

Mostly clear, with a low around 43. East wind 5 to 8 mph becoming south southeast after midnight. Winds could gust as high as 17 mph.

Wednesday

Sunny, with a high near 82. Calm wind becoming north northwest around 6 mph in the afternoon. Winds could gust as high as 15 mph.

Wednesday Night

Mostly clear, with a low around 45.

Thursday

Sunny, with a high near 83.

Thursday Night

A slight chance of showers before midnight. Partly cloudy, with a low around 46.

Friday

Showers and thunderstorms likely after noon. Partly sunny, with a high near 79.

Friday Night

A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 41.

Saturday

A chance of showers and thunderstorms. Partly sunny, with a high near 76.

Saturday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 43.

Sunday

Showers and thunderstorms likely. Partly sunny, with a high near 73.

Additional Forecasts and Information

Zone Area Forecast for South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet, CO

Basemap Options

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ABOUT THIS FORECAST

Point Forecast:

10 Miles NNE Silverthorne CO
39.8°N 106.03°W (Elev. 8996 ft)

4:00 am MDT Aug 18, 2025

Forecast Valid:

1pm MDT Aug 18, 2025-6pm MDT Aug 24, 2025

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