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.

Overcast

52°F

11°C

Humidity 93%
Wind Speed N 13 mph
Barometer 29.97 in (1014.8 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 5 Nov 10:54 pm CST
Extended Forecast for

Niantic IL

  • Tonight

    Tonight: A slight chance of drizzle before 3am. Cloudy, with a low around 43. North wind 10 to 13 mph, with gusts as high as 18 mph.

    Low: 43 °F

    Slight Chance
    Drizzle

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 49. North northwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 49 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 29. North northwest wind around 6 mph becoming calm in the evening.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 52. Calm wind becoming west northwest around 6 mph.

    High: 52 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 31. Light west southwest wind.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 60. West southwest wind 3 to 8 mph.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. West southwest wind around 5 mph becoming calm in the evening.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

Detailed Forecast

Tonight
A slight chance of drizzle before 3am. Cloudy, with a low around 43. North wind 10 to 13 mph, with gusts as high as 18 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 49. North northwest wind 7 to 13 mph, with gusts as high as 18 mph.
Friday Night
Mostly clear, with a low around 29. North northwest wind around 6 mph becoming calm in the evening.
Saturday
Sunny, with a high near 52. Calm wind becoming west northwest around 6 mph.
Saturday Night
Mostly clear, with a low around 31. Light west southwest wind.
Sunday
Sunny, with a high near 60. West southwest wind 3 to 8 mph.
Sunday Night
Mostly clear, with a low around 35. West southwest wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 66.
Monday Night
Clear, with a low around 39.
Tuesday
Sunny, with a high near 65.
Tuesday Night
Mostly clear, with a low around 36.
Veterans Day
Sunny, with a high near 63.
Wednesday Night
Mostly clear, with a low around 37.
Thursday
Sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Niantic IL
 39.85°N 89.17°W (Elev. 600 ft)
Last Update:
9:31 pm CST Nov 5, 2026
Forecast Valid:
11pm CST Nov 5, 2026-6pm CST Nov 12, 2026
 
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