Illiopolis Weather Forecast
- 71
- 91
Becoming Sunny
- 70
- 92
Rain Showers
- 61
- 80
Rain Showers
- 50
- 77
Rain Showers
- 37
- 61
Breezy
- 37
- 61
Sunny
Today 12 Oct Sangamon
Sunny. Highs in the lower 90s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.
Tonight 12 Oct Sangamon
Mostly clear. Not as cool with Lows in the lower 70s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph.
Illiopolis Temperature Statistics
October Temperature
Decatur Airport (19.3 miles)
Lowest 6 October, 2026
41.6 °FAverage October
63.6 °FHighest 1 October, 2026
88.6 °F
Climate (2021–2026)
Decatur Airport (19.3 miles)
Average Low 2021–2026
45.3 °FAverage 2021–2026
55.6 °FAverage High 2021–2026
65.7 °F