National Weather Service

News Headlines

October 2026 Climate Summary

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

45°F

7°C

Humidity	93%
Wind Speed	N 10 mph
Barometer	30.09 in (1019.2 mb)
Dewpoint	43°F (6°C)
Visibility	10.00 mi
Wind Chill	40°F (4°C)
Last update	6 Nov 4:54 am CST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

2 Miles SE Harristown IL

Overnight
Low: 43 °F
Patchy
Drizzle
Friday
High: 50 °F
Patchy
Drizzle then
Sunny
Friday Night
Low: 29 °F
Mostly Clear
Saturday
High: 51 °F
Sunny
Saturday Night
Low: 31 °F
Mostly Clear
Sunday
High: 61 °F
Sunny
Sunday Night
Low: 35 °F
Mostly Clear
Monday
High: 66 °F
Sunny
Monday Night
Low: 40 °F
Clear

Detailed Forecast

Overnight

Patchy drizzle. Cloudy, with a low around 43. North wind around 11 mph, with gusts as high as 16 mph.

Friday

Patchy drizzle before 9am. Cloudy through mid morning, then gradual clearing, with a high near 50. North northwest wind 7 to 13 mph, with gusts as high as 18 mph.

Friday Night

Mostly clear, with a low around 29. North northwest wind around 5 mph becoming calm in the evening.

Saturday

Sunny, with a high near 51. Calm wind becoming west northwest around 6 mph.

Saturday Night

Mostly clear, with a low around 31. Calm wind becoming west southwest around 6 mph after midnight.

Sunday

Sunny, with a high near 61. West southwest wind 6 to 9 mph.

Sunday Night

Mostly clear, with a low around 35. West wind around 6 mph becoming calm in the evening.

Monday

Sunny, with a high near 66.