National Weather Service United States Department of Commerce

Heavy rain possible for parts of the northern Rockies & Plains; Severe storms for the Upper Midwest

An unseasonably strong storm system in the northwest U.S. will bring showers and thunderstorms, some heavy, to parts of the northern Rockies and northern Plains through Saturday. Isolated flash floods will be possible in these areas. Some of the storms could be severe in parts of the Dakotas into Minnesota, with large hail and damaging winds.
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Hazardous Weather Conditions

Current Conditions

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Dekalb IL

7 Day Forecast

For More Weather Information:

Chicago, IL Local Forecast Office

Overnight

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

Low: 70 °F

Saturday

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

High: 84 °F

Saturday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 70 °F

Sunday

Mostly Sunny

Mostly
Sunny

High: 88 °F

Sunday
Night

Partly Cloudy

Partly
Cloudy

Low: 71 °F

Monday

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

High: 89 °F

Monday
Night

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

Low: 69 °F

Tuesday

Chance Thunderstorms

Chance
Thunderstorms

High: 86 °F

Tuesday
Night

Chance Thunderstorms

Chance
Thunderstorms

Low: 68 °F

Detailed Forecast

  • Overnight A 30 percent chance of showers and thunderstorms. Areas of fog. Otherwise, mostly cloudy, with a low around 70. Calm wind.
  • Saturday A 40 percent chance of showers and thunderstorms. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 84. East wind around 5 mph.
  • Saturday Night A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 70. East wind around 5 mph.
  • Sunday Mostly sunny, with a high near 88. Heat index values as high as 96. Southeast wind 5 to 10 mph, with gusts as high as 15 mph.
  • Sunday Night Partly cloudy, with a low around 71. Southeast wind around 5 mph.
  • Monday A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
  • Monday Night A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
  • Tuesday A chance of showers and thunderstorms. Partly sunny, with a high near 86.
  • Tuesday Night A chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
  • Wednesday A chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
  • Wednesday Night A chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
  • Thursday A slight chance of showers. Partly sunny, with a high near 75.
  • Thursday Night Partly cloudy, with a low around 55.
  • Friday Sunny, with a high near 74.