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.

Fog/Mist

45°F

7°C

Humidity 90%
Wind Speed NE 6 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 42°F (6°C)
Visibility 5.00 mi
Wind Chill42°F (6°C)
Last update 22 Nov 12:54 am CST
Extended Forecast for

Niantic IL

  • Overnight

    Overnight: A 20 percent chance of rain before 2am. Mostly cloudy, with a low around 37. North wind 6 to 8 mph.

    Low: 37 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: Sunny, with a high near 53. Light and variable wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 53 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 36. Southwest wind 6 to 8 mph becoming west northwest after midnight. Winds could gust as high as 17 mph.

    Low: 36 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 56. West northwest wind around 6 mph becoming calm in the afternoon.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 36. Calm wind becoming south southeast 5 to 7 mph after midnight.

    Low: 36 °F

    Increasing
    Clouds

  • Monday

    Monday: A 50 percent chance of rain after noon. Mostly cloudy, with a high near 55. South southeast wind 7 to 14 mph, with gusts as high as 20 mph.

    High: 55 °F

    Mostly Cloudy
    then Chance
    Rain

  • Monday Night

    Monday Night: Rain. Low around 47. South southeast wind 9 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Rain then
    Rain Likely

  • Tuesday

    Tuesday: A 30 percent chance of rain. Mostly cloudy, with a high near 61.

    High: 61 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of rain before 2am. Mostly cloudy, with a low around 37. North wind 6 to 8 mph.
Saturday
Sunny, with a high near 53. Light and variable wind becoming west southwest 5 to 7 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 36. Southwest wind 6 to 8 mph becoming west northwest after midnight. Winds could gust as high as 17 mph.
Sunday
Sunny, with a high near 56. West northwest wind around 6 mph becoming calm in the afternoon.
Sunday Night
Increasing clouds, with a low around 36. Calm wind becoming south southeast 5 to 7 mph after midnight.
Monday
A 50 percent chance of rain after noon. Mostly cloudy, with a high near 55. South southeast wind 7 to 14 mph, with gusts as high as 20 mph.
Monday Night
Rain. Low around 47. South southeast wind 9 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
A 30 percent chance of rain. Mostly cloudy, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
Mostly sunny, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 24.
Thanksgiving Day
Mostly sunny, with a high near 40.
Thursday Night
Partly cloudy, with a low around 22.
Friday
Mostly sunny, with a high near 40.
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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:
1:05 am CST Nov 22, 2025
Forecast Valid:
1am CST Nov 22, 2025-6pm CST Nov 28, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation