National Weather Service United States Department of Commerce

Heavy rain and mountain snow across the northwestern U.S. this weekend

A Pacific storm system will continue to impact the West Coast through Sunday. Heavy rainfall could lead to flash flooding, river and small stream flooding, as well as mudslides and debris flows, especially over burn scars. At higher elevations, strong winds and heavy snowfall, with accumulations of 1 to 3 feet, could result in hazardous travel through mountain passes.
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Hazardous Weather Conditions

Current Conditions

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Longmont CO

7 Day Forecast

For More Weather Information:

Denver-Boulder, CO Local Forecast Office

Tonight

Mostly Cloudy

Mostly
Cloudy

Low: 24 °F

Sunday

Breezy

Breezy

High: 53 °F

Sunday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 27 °F

Monday

Breezy

Breezy

High: 44 °F

Monday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 19 °F

Tuesday

Mostly Sunny

Mostly
Sunny

High: 40 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 21 °F

Wednesday

Mostly Sunny

Mostly
Sunny

High: 48 °F

Wednesday
Night

Partly Cloudy

Partly
Cloudy

Low: 24 °F

Detailed Forecast

  • Tonight Mostly cloudy, with a low around 24. Light and variable wind becoming south southwest around 6 mph after midnight.
  • Sunday Mostly cloudy, with a high near 53. Breezy, with a west wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.
  • Sunday Night Mostly cloudy, with a low around 27. West southwest wind 5 to 11 mph, with gusts as high as 17 mph.
  • Monday Partly sunny, with a high near 44. Breezy, with a light and variable wind becoming north northwest 12 to 17 mph in the morning. Winds could gust as high as 28 mph.
  • Monday Night Mostly cloudy, with a low around 19. Northwest wind 8 to 10 mph, with gusts as high as 16 mph.
  • Tuesday Mostly sunny, with a high near 40.
  • Tuesday Night Partly cloudy, with a low around 21.
  • Wednesday Mostly sunny, with a high near 48.
  • Wednesday Night Partly cloudy, with a low around 24.
  • Christmas Day Mostly cloudy, with a high near 43.
  • Thursday Night A slight chance of snow. Mostly cloudy, with a low around 16.
  • Friday Partly sunny, with a high near 32.
  • Friday Night Partly cloudy, with a low around 10.
  • Saturday Mostly sunny, with a high near 38.