Forecast Details for Saint Peter, IL

Recent Locations: Cartersville, GA Graham, OK Saint Peter, IL

Today: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10am. High near 66. Northeast wind 6 to 9 mph. Chance of precipitation is 90%.

Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 61. East wind 7 to 13 mph becoming south after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 50%.

Thursday: Showers likely and possibly a thunderstorm, mainly after 1pm. Mostly cloudy, with a high near 77. Breezy, with a south wind 17 to 22 mph increasing to 23 to 28 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 60%.

Thursday Night: Showers likely and possibly a thunderstorm before 1am, then showers likely between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Partly cloudy, with a low around 62. Breezy, with a south wind 17 to 22 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 70%.

Friday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 78. South wind 10 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 58. Chance of precipitation is 80%.

Saturday: Showers and possibly a thunderstorm before 1pm, then showers likely. High near 65. Chance of precipitation is 80%.

Saturday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 38.

Sunday: Sunny, with a high near 54.

Sunday Night: Mostly clear, with a low around 34.

Monday: Sunny, with a high near 62.

Monday Night: Partly cloudy, with a low around 39.

Tuesday: Mostly sunny, with a high near 59.

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

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North America Water Vapor (Moisture)

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Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

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