National Weather Service United States Department of Commerce

Flash flooding possible for parts of Upper Midwest

A slow-moving weather system progressing from the northern Plains to the Great Lakes will bring excessive rainfall and a risk of flash flooding to portions of the Upper Midwest on Friday. The heaviest rainfall is expected from central Iowa northeastward across southeastern Minn. and into Wisc. Rainfall totals of 1-2 inches, with locally-higher amounts, are possible through Saturday morning.
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Hazardous Weather Conditions

Current Conditions

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Collinsville IL

7 Day Forecast

For More Weather Information:

Saint Louis, MO Local Forecast Office

Tonight

Scattered Thunderstorms Chance for Measurable Precipitation 50%

Scattered
Thunderstorms

Low: 71 °F

Saturday

Thunderstorms Likely Chance for Measurable Precipitation 60%

Thunderstorms
Likely

High: 87 °F

Saturday
Night

Thunderstorms Likely Chance for Measurable Precipitation 60%

Thunderstorms
Likely

Low: 70 °F

Sunday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 86 °F

Sunday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 71 °F

Labor
Day

Chance Thunderstorms Chance for Measurable Precipitation 50%

Chance
Thunderstorms

High: 87 °F

Monday
Night

Thunderstorms Likely Chance for Measurable Precipitation 60%

Thunderstorms
Likely

Low: 71 °F

Tuesday

Thunderstorms Likely Chance for Measurable Precipitation 60%

Thunderstorms
Likely

High: 87 °F

Tuesday
Night

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

Low: 69 °F

Detailed Forecast

  • Tonight Scattered showers and thunderstorms. Mostly cloudy, with a low around 71. South wind 6 to 8 mph. Chance of precipitation is 50%.
  • Saturday Showers and thunderstorms likely, mainly after 2pm. Mostly cloudy, with a high near 87. South wind 6 to 10 mph. Chance of precipitation is 60%.
  • Saturday Night Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 70. South wind 3 to 8 mph. Chance of precipitation is 60%.
  • Sunday A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. South wind 3 to 8 mph.
  • Sunday Night A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 71. South wind around 7 mph. Chance of precipitation is 20%.
  • Labor Day A 50 percent chance of showers and thunderstorms, mainly after 8am. Mostly cloudy, with a high near 87.
  • Monday Night Showers and thunderstorms likely, mainly after 8pm. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.
  • Tuesday Showers and thunderstorms likely. Partly sunny, with a high near 87. Chance of precipitation is 60%.
  • Tuesday Night A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
  • Wednesday A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
  • Wednesday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
  • Thursday A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
  • Thursday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
  • Friday A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.