Thunderstorms and Heavy Rainfall from the Plains to the Mid-Atlantic

Severe thunderstorms producing damaging winds are most likely over parts of the Dakotas into Minnesota from this afternoon into the overnight, with other isolated storms producing hail or wind over the northern High Plains. In the Northern Plains into the Upper Great Lakes and Mid-Atlantic, heavy to excessive rain may bring flash and urban flooding through Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Partly Cloudy

79°F

26°C

Humidity 77%
Wind Speed NE 6 mph
Barometer 30.10 in (1018.7 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 7 Jul 10:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: Mostly sunny, with a high near 85. North northeast wind around 7 mph.

    High: 85 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 65. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. Light and variable wind.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68. Calm wind becoming south southwest around 5 mph after midnight.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 89. Southwest wind 5 to 8 mph.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 70. Southwest wind 3 to 5 mph.  Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 70 °F

    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm after 1pm.  Partly sunny, with a high near 85. West wind 5 to 8 mph.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms.  Partly sunny, with a high near 84.

    High: 84 °F

    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 85. North northeast wind around 7 mph.
Tonight
Mostly clear, with a low around 65. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 86. Light and variable wind.
Wednesday Night
Mostly clear, with a low around 68. Calm wind becoming south southwest around 5 mph after midnight.
Thursday
Mostly sunny, with a high near 89. Southwest wind 5 to 8 mph.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Southwest wind 3 to 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 85. West wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
Mostly sunny, with a high near 86.
Sunday Night
Mostly clear, with a low around 67.
Monday
Sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
10:36 am CDT Jul 7, 2026
11am CDT Jul 7, 2026-6pm CDT Jul 13, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database