Forecast Details for Spearfish, SD

Recent Locations: Antelope, OR Fillmore, CA Spearfish, SD

Tonight: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Southeast wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.

Friday: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3pm. High near 66. Light and variable wind becoming northeast 5 to 10 mph in the morning. Chance of precipitation is 80%.

Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 55. North wind 5 to 10 mph becoming south in the evening. Chance of precipitation is 70%.

Saturday: Showers likely and possibly a thunderstorm before 9am, then showers likely between 9am and noon, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 65. West wind 5 to 10 mph becoming northeast in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 60%.

Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 52. Northeast wind around 5 mph becoming southwest after midnight. Chance of precipitation is 30%.

Sunday: Mostly sunny, with a high near 71. South wind 5 to 10 mph becoming northeast in the morning. Winds could gust as high as 15 mph.

Sunday Night: Mostly clear, with a low around 53. East wind around 5 mph becoming southwest after midnight.

Labor Day: Sunny, with a high near 76. Southwest wind 5 to 10 mph becoming north in the afternoon. Winds could gust as high as 15 mph.

Monday Night: Mostly clear, with a low around 55.

Tuesday: Sunny, with a high near 78.

Tuesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 52.

Wednesday: A slight chance of showers. Mostly sunny, with a high near 66.

Wednesday Night: Partly cloudy, with a low around 48.

Thursday: Sunny, with a high near 72.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

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 Cirrostratus Clouds?

Home - Education - Cloud Types - Cirrostratus Clouds

Next Topic: Cirrus Clouds

Cirrostratus clouds are high, thin clouds that form above 20,000 feet and are made mostly of ice crystals. They sometimes look like giant feathers, horse tails, or curls of hair in the sky. These clouds are pushed by the jet stream and can move at high speeds reaching 100 mph.

What do they indicate?
They indicate that a precipitation is likely within 24 hours.

Next Topic: Cirrus Clouds

Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails