Forecast Details for Longmont, CO

Recent Locations: Longmont, CO

Tonight: A 40 percent chance of showers and thunderstorms before 9pm. Cloudy during the early evening, then gradual clearing, with a low around 37. North northeast wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 20 mph.

Friday: Sunny, with a high near 66. Calm wind becoming east northeast around 6 mph in the afternoon. Winds could gust as high as 21 mph.

Friday Night: Mostly clear, with a low around 38. East southeast wind around 6 mph becoming calm in the evening. Winds could gust as high as 21 mph.

Saturday: Sunny, with a high near 76. Calm wind becoming east southeast 5 to 7 mph in the afternoon.

Saturday Night: Mostly clear, with a low around 44. East southeast wind 5 to 7 mph becoming calm in the evening.

Sunday: A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 77. Breezy. Chance of precipitation is 20%.

Sunday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 47. Chance of precipitation is 30%.

Monday: A slight chance of showers, then showers and possibly a thunderstorm after noon. Mostly cloudy, with a high near 69.

Monday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 44.

Tuesday: Showers. Cloudy, with a high near 52.

Tuesday Night: Showers likely. Mostly cloudy, with a low around 40.

Wednesday: A chance of showers. Mostly cloudy, with a high near 59.

Wednesday Night: A chance of showers. Mostly cloudy, with a low around 41.

Thursday: A chance of showers. Partly sunny, with a high near 67.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle

Weather Topic: What is Evaporation?

Home - Education - Precipitation - Evaporation

Next Topic: Fog

Evaporation is the process which returns water from the earth back to the atmosphere, and is another crucial process in the water cycle.

Evaporation is the transformation of liquid into gas, and it happens because molecules are excited by the application of energy and turn into vapor. In order for water to evaporate it has to be on the surface of a body of water.

Next Topic: Fog