Hazardous Weather Conditions
Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Fog/Mist
49°F
9°C
| Humidity | 100% |
| Wind Speed | W 6 mph |
| Barometer | 29.96 in (1014.8 mb) |
| Dewpoint | 49°F (9°C) |
| Visibility | 2.00 mi |
| Wind Chill | 46°F (8°C) |
| Last update | 5 Mar 6:54 am CST |
Extended Forecast for
2 Miles ENE Harristown IL
Dense Fog Advisory March 5, 07:34am until March 5, 09:00am
NOW until 9:00am Thu

Dense Fog Advisory
Today

High: 60 °F
Chance
Showers and
Areas Dense
FogTonight
Low: 50 °F
Fog then
Chance
T-storms and
FogFriday
High: 76 °F
Chance
T-storms and
Patchy FogFriday Night
Low: 58 °F
Breezy.
Chance
Showers then
ShowersSaturday
High: 63 °F⇓
Chance
Showers then
Mostly CloudySaturday Night

Low: 37 °F
Decreasing
CloudsSunday

High: 61 °F
Sunny
Sunday Night

Low: 45 °F
Mostly Clear
Detailed Forecast
Today
A 30 percent chance of showers, mainly before 11am. Areas of dense fog before noon. Otherwise, cloudy, with a high near 60. Light southwest wind becoming west 5 to 9 mph in the morning.
Tonight
A 50 percent chance of showers and thunderstorms after 3am. Widespread fog, mainly before 3am. Otherwise, mostly cloudy, with a low around 50. Light and variable wind becoming south southeast 5 to 10 mph after midnight. Winds could gust as high as 16 mph.
Friday
A chance of showers and thunderstorms before noon, then a slight chance of showers. Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 76. Breezy, with a south wind 10 to 15 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 40%.
Friday Night
A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 58. Breezy, with a south wind 16 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A 50 percent chance of showers before noon. Mostly cloudy, with a temperature rising to near 63 by 9am, then falling to around 53 during the remainder of the day. Southwest wind 13 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 37. Northwest wind 6 to 11 mph, with gusts as high as 17 mph.
Sunday
Sunny, with a high near 61. Southwest wind 6 to 14 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 73.
Monday Night
A 30 percent chance of showers and thunderstorms after midnight. Mostly clear, with a low around 57.
Tuesday
Showers. Mostly cloudy, with a high near 72. Breezy.
Tuesday Night
Showers. Cloudy, with a low around 48. Breezy.
Wednesday
Showers likely. Mostly cloudy, with a high near 58. Breezy.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
2 Miles ENE Harristown IL
39.84°N 89.03°W (Elev. 666 ft)
39.84°N 89.03°W (Elev. 666 ft)
4:27 am CST Mar 5, 2026
7am CST Mar 5, 2026-6pm CDT Mar 11, 2026



