Hazardous Weather Conditions
Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Fair
77°F
25°C
| Humidity | 66% |
| Wind Speed | S 16 G 22 mph |
| Barometer | 29.90 in (1012.0 mb) |
| Dewpoint | 65°F (18°C) |
| Visibility | 10.00 mi |
| Heat Index | 79°F (26°C) |
| Last update | 17 Apr 11:54 am CDT |
Extended Forecast for
2 Miles ENE Harristown IL
This Afternoon

High: 83 °F
Slight Chance
T-storms and
BreezyTonight

Low: 46 °F
Heavy Rain
Saturday
High: 55 °F
Breezy.
Chance
Showers then
SunnySaturday Night

Low: 36 °F
Mostly Clear
then Patchy
FrostSunday

High: 59 °F
Patchy Frost
then SunnySunday Night

Low: 36 °F
Mostly Clear
then Patchy
FrostMonday

High: 64 °F
Patchy Frost
then SunnyMonday Night

Low: 49 °F
Mostly Clear
Tuesday
High: 76 °F
Mostly Sunny
then Mostly
Sunny and
Breezy
Detailed Forecast
This Afternoon
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 83. Breezy, with a south wind 17 to 22 mph, with gusts as high as 32 mph.
Tonight
Showers and thunderstorms. Some of the storms could produce heavy rainfall. Low around 46. South wind around 18 mph becoming west southwest in the evening. Winds could gust as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A 30 percent chance of showers, mainly before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 55. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 29 mph.
Saturday Night
Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 8 to 16 mph, with gusts as high as 24 mph.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 8 to 17 mph, with gusts as high as 26 mph.
Sunday Night
Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. North northwest wind 6 to 10 mph becoming east after midnight. Winds could gust as high as 17 mph.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 64. East wind 6 to 10 mph becoming south in the afternoon. Winds could gust as high as 15 mph.
Monday Night
Mostly clear, with a low around 49.
Tuesday
Mostly sunny, with a high near 76. Breezy.
Tuesday Night
Mostly clear, with a low around 55.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Mostly sunny, with a high near 80.
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)
12:36 pm CDT Apr 17, 2026
12pm CDT Apr 17, 2026-6pm CDT Apr 23, 2026



