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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Current Conditions

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Decatur IL

7 Day Forecast

For More Weather Information:

Lincoln, IL Local Forecast Office

Today

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 90 °F

Tonight

Partly Cloudy

Partly
Cloudy

Low: 74 °F

Sunday

Mostly Sunny

Mostly
Sunny

High: 94 °F

Sunday
Night

Partly Cloudy

Partly
Cloudy

Low: 73 °F

Monday

Sunny

Sunny

High: 94 °F

Monday
Night

Partly Cloudy

Partly
Cloudy

Low: 74 °F

Tuesday

Mostly Sunny

Mostly
Sunny

High: 91 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 72 °F

Wednesday

Chance Thunderstorms

Chance
Thunderstorms

High: 88 °F

Detailed Forecast

  • Today A 20 percent chance of showers and thunderstorms after noon. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 90. Heat index values as high as 102. Light and variable wind becoming northeast around 6 mph in the morning.
  • Tonight Partly cloudy, with a low around 74. East southeast wind around 6 mph.
  • Sunday Mostly sunny, with a high near 94. Heat index values as high as 105. Southeast wind around 6 mph.
  • Sunday Night Partly cloudy, with a low around 73. Southeast wind around 5 mph.
  • Monday Sunny, with a high near 94. South southeast wind around 6 mph.
  • Monday Night Partly cloudy, with a low around 74.
  • Tuesday Mostly sunny, with a high near 91.
  • Tuesday Night Partly cloudy, with a low around 72.
  • Wednesday A chance of showers and thunderstorms. Partly sunny, with a high near 88.
  • Wednesday Night A chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
  • Thursday A chance of showers and thunderstorms. Partly sunny, with a high near 82.
  • Thursday Night Mostly cloudy, with a low around 62.
  • Friday Partly sunny, with a high near 79.