National Weather Service United States Department of Commerce

A stalled frontal boundary and ample monsoonal moisture will lead to flash flood potential from the Great Basin to the Great Plains tonight and Tuesday

A stalled frontal boundary will set up along the southern and central Rockies for the next couple of days providing focus for showers and thunderstorms. In addition, ample monsoonal moisture will stream in across the southwest bringing enough moisture to introduce a flash flood threat from the Great Basin and Southwest eastward across the central and southern Rockies into the adjacent Plains.
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Current Conditions

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Longmont CO

7 Day Forecast

For More Weather Information:

Denver-Boulder, CO Local Forecast Office

Tonight

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 59 °F

Tuesday

Heavy Rain Chance for Measurable Precipitation 60%

Heavy
Rain

High: 79 °F

Tuesday
Night

Heavy Rain Chance for Measurable Precipitation 70%

Heavy
Rain

Low: 57 °F

Wednesday

Heavy Rain Chance for Measurable Precipitation 50%

Heavy
Rain

High: 73 °F

Wednesday
Night

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

Low: 52 °F

Thursday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 78 °F

Thursday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 10%

Slight Chc
Thunderstorms

Low: 57 °F

Friday

Slight Chance Thunderstorms

Slight Chc
Thunderstorms

High: 77 °F

Friday
Night

Slight Chance Thunderstorms

Slight Chc
Thunderstorms

Low: 57 °F

Detailed Forecast

  • Tonight A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 59. South wind around 6 mph becoming light and variable after midnight.
  • Tuesday Showers and thunderstorms likely, mainly after 4pm. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 79. Northeast wind 5 to 8 mph. Chance of precipitation is 60%.
  • Tuesday Night Showers and thunderstorms likely, mainly before midnight. Some of the storms could produce heavy rain. Cloudy, with a low around 57. North wind 8 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 70%.
  • Wednesday A 50 percent chance of showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a high near 73. North wind 6 to 9 mph becoming west in the afternoon.
  • Wednesday Night A 30 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 52. West southwest wind 5 to 7 mph becoming calm.
  • Thursday A 20 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78.
  • Thursday Night A 10 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 57.
  • Friday A slight chance of showers and thunderstorms. Partly sunny, with a high near 77.
  • Friday Night A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
  • Saturday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 79.
  • Saturday Night A slight chance of showers and thunderstorms. Partly cloudy, with a low around 58.
  • Sunday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 81.
  • Sunday Night A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
  • Monday Mostly sunny, with a high near 82.