Illiopolis Weather Forecast

    • 32
    • 56

    Increasing Clouds

    • 40
    • 51

    Rain Likely

    • 35
    • 58

    Mostly Sunny

    • 42
    • 59

    Mostly Cloudy

    • 52
    • 62

    Mostly Cloudy

    • 41
    • 67

    Slight Chance Rain

Today 13 Feb Sangamon

Sunny. Highs in the mid 50s. South Winds 10 to 15 Mph.

Tonight 13 Feb Sangamon

Mostly clear. Lows around 30. Southeast Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Illiopolis Temperature Statistics

February Temperature

Decatur Airport (19.3 miles)

  • Lowest 1 February, 2026

    0.6 °F

  • Average February

    25.8 °F

  • Highest 10 February, 2026

    55.9 °F

Climate (2021–Present)

Decatur Airport (19.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    65.2 °F
Get WillyWeather+ to remove ads