National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

25°F

-4°C

Humidity 81%
Wind Speed SW 9 mph
Barometer 30.37 in (1029.3 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 12 Jan 12:54 am CST
Extended Forecast for

Niantic IL

  • Overnight

    Overnight: Clear, with a low around 24. South southwest wind around 10 mph, with gusts as high as 21 mph.

    Low: 24 °F

    Clear

  • Monday

    Monday: Mostly sunny, with a high near 45. West southwest wind 8 to 11 mph, with gusts as high as 21 mph.

    High: 45 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 33. South southwest wind 7 to 11 mph, with gusts as high as 18 mph.

    Low: 33 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 54. West southwest wind 11 to 18 mph, with gusts as high as 25 mph.

    High: 54 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34. West wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 40. Breezy, with a northwest wind 14 to 24 mph, with gusts as high as 37 mph.

    High: 40 °F

    Breezy.
    Mostly Cloudy
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 15. Blustery, with a north northwest wind 15 to 20 mph, with gusts as high as 32 mph.

    Low: 15 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Sunny, with a high near 30.

    High: 30 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 24. South southwest wind around 10 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 45. West southwest wind 8 to 11 mph, with gusts as high as 21 mph.
Monday Night
Partly cloudy, with a low around 33. South southwest wind 7 to 11 mph, with gusts as high as 18 mph.
Tuesday
Partly sunny, with a high near 54. West southwest wind 11 to 18 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 34. West wind 10 to 13 mph, with gusts as high as 21 mph.
Wednesday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 40. Breezy, with a northwest wind 14 to 24 mph, with gusts as high as 37 mph.
Wednesday Night
Mostly cloudy, with a low around 15. Blustery, with a north northwest wind 15 to 20 mph, with gusts as high as 32 mph.
Thursday
Sunny, with a high near 30.
Thursday Night
Mostly cloudy, with a low around 24.
Friday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 37.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
Mostly cloudy, with a high near 27.
Saturday Night
Partly cloudy, with a low around 11.
Sunday
Mostly sunny, with a high near 26.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Niantic IL
 39.85°N 89.17°W (Elev. 600 ft)
Last Update:
10:57 pm CST Jan 11, 2026
Forecast Valid:
1am CST Jan 12, 2026-6pm CST Jan 18, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation