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

72°F

22°C

Humidity 61%
Wind Speed W 16 G 25 mph
Barometer 29.62 in (1002.6 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 15 Nov 11:54 am CST
Extended Forecast for

Niantic IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 75. Northwest wind 13 to 18 mph, with gusts as high as 25 mph.

    High: 75 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 37. North northwest wind 8 to 14 mph, with gusts as high as 23 mph.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 54. Northwest wind 7 to 10 mph, with gusts as high as 15 mph.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 30. Northwest wind around 6 mph becoming calm in the evening.

    Low: 30 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 55. Light and variable wind becoming east southeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 55 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Rain. Low around 42. East southeast wind 10 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 42 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before noon. Mostly cloudy, with a high near 56. East southeast wind 10 to 14 mph, with gusts as high as 20 mph.

    High: 56 °F

    Chance Rain
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 75. Northwest wind 13 to 18 mph, with gusts as high as 25 mph.
Tonight
Clear, with a low around 37. North northwest wind 8 to 14 mph, with gusts as high as 23 mph.
Sunday
Sunny, with a high near 54. Northwest wind 7 to 10 mph, with gusts as high as 15 mph.
Sunday Night
Mostly clear, with a low around 30. Northwest wind around 6 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 55. Light and variable wind becoming east southeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Monday Night
Rain. Low around 42. East southeast wind 10 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
A 30 percent chance of rain before noon. Mostly cloudy, with a high near 56. East southeast wind 10 to 14 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Partly sunny, with a high near 56.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 44.
Thursday
Rain. Mostly cloudy, with a high near 59.
Thursday Night
Rain likely. Mostly cloudy, with a low around 46.
Friday
A chance of rain. Mostly cloudy, with a high near 60.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Niantic IL
 39.85°N 89.17°W (Elev. 600 ft)
Last Update:
11:36 am CST Nov 15, 2025
Forecast Valid:
12pm CST Nov 15, 2025-6pm CST Nov 21, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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