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Hazardous Weather Conditions
Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Fair
78°F
26°C
| Humidity | 45% |
| Wind Speed | N 8 mph |
| Barometer | 29.99 in (1015.0 mb) |
| Dewpoint | 55°F (13°C) |
| Visibility | 10.00 mi |
| Heat Index | 79°F (26°C) |
| Last update | 20 Jun 1:54 pm CDT |
Extended Forecast for
Harristown IL
Flood Watch June 21, 07:00am until June 22, 01:00am
This Afternoon
High: 80 °F
Mostly Sunny
Tonight
Low: 61 °F
Increasing
CloudsSunday
High: 75 °F
Heavy Rain
Sunday Night
Low: 61 °F
Heavy Rain
then Chance
ShowersMonday
High: 73 °F
Mostly Cloudy
Monday Night
Low: 55 °F
Mostly Clear
Tuesday
High: 77 °F
Sunny
Tuesday Night
Low: 58 °F
Mostly Clear
Wednesday
High: 79 °F
Mostly Sunny
Detailed Forecast
This Afternoon
Mostly sunny, with a high near 80. West northwest wind around 8 mph.
Tonight
Increasing clouds, with a low around 61. Northwest wind around 5 mph becoming calm.
Sunday
Showers and thunderstorms, mainly after 9am. Some of the storms could produce heavy rainfall. High near 75. East wind 7 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Some of the storms could produce heavy rainfall. Low around 61. Southeast wind 10 to 17 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
Mostly cloudy, with a high near 73. North wind around 14 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 55. North northeast wind 5 to 9 mph, with gusts as high as 15 mph.
Tuesday
Sunny, with a high near 77. North northeast wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 80.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Harristown IL
39.82°N 89.06°W (Elev. 600 ft)
39.82°N 89.06°W (Elev. 600 ft)
1:26 pm CDT Jun 20, 2026
2pm CDT Jun 20, 2026-6pm CDT Jun 26, 2026
Additional Resources
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Hourly Weather Forecast
