Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Fair
38°F
3°C
| Humidity | 93% |
| Wind Speed | SE 5 mph |
| Barometer | 30.11 in (1020.1 mb) |
| Dewpoint | 36°F (2°C) |
| Visibility | 10.00 mi |
| Wind Chill | 34°F (1°C) |
| Last update | 9 Jan 11:54 pm CST |
Extended Forecast for
Decatur IL
Overnight

Low: 35 °F
Chance Rain
Saturday
High: 42 °F
Rain Likely
then Slight
Chance
Rain/SnowSaturday Night
Low: 22 °F
Slight Chance
Snow Showers
then Partly
CloudySunday

High: 34 °F
Mostly Sunny
Sunday Night

Low: 24 °F
Mostly Clear
Monday

High: 45 °F
Sunny
Monday Night

Low: 33 °F
Partly Cloudy
Tuesday

High: 51 °F
Partly Sunny
Tuesday Night

Low: 33 °F
Mostly Cloudy
Detailed Forecast
Overnight
A 30 percent chance of rain after 3am. Mostly cloudy, with a low around 35. Light and variable wind.
Saturday
Rain likely before 5pm, then a slight chance of snow showers. Cloudy through mid morning, then gradual clearing, with a high near 42. West northwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Saturday Night
A 20 percent chance of snow showers before midnight. Partly cloudy, with a low around 22. West northwest wind 13 to 18 mph, with gusts as high as 29 mph.
Sunday
Mostly sunny, with a high near 34. West northwest wind 13 to 18 mph decreasing to 7 to 12 mph in the afternoon. Winds could gust as high as 29 mph.
Sunday Night
Mostly clear, with a low around 24. South southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Monday
Sunny, with a high near 45. West southwest wind 9 to 13 mph, with gusts as high as 21 mph.
Monday Night
Partly cloudy, with a low around 33. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
A chance of rain and snow after noon. Mostly cloudy, with a high near 39. Chance of precipitation is 30%.
Wednesday Night
Mostly cloudy, with a low around 19.
Thursday
Partly sunny, with a high near 31.
Thursday Night
Mostly cloudy, with a low around 22.
Friday
Mostly cloudy, with a high near 37.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Decatur IL
39.84°N 88.94°W (Elev. 692 ft)
39.84°N 88.94°W (Elev. 692 ft)
9:37 pm CST Jan 9, 2026
12am CST Jan 10, 2026-6pm CST Jan 16, 2026


