Illiopolis Weather Forecast

    • 55
    • 78

    Slight Chance Thunderstorms

    • 56
    • 79

    Severe Tstms

    • 34
    • 67

    Slight Chance Rain Showers

    • 34
    • 48

    Mostly Sunny

    • 49
    • 65

    Mostly Sunny

    • 52
    • 73

    Mostly Cloudy

    • 34
    • 67

    Rain Likely

Today 13 Mar Sangamon

Sunny. Near steady temperature in the mid 70s. Southeast Winds 5 to 10 Mph.

Tonight 13 Mar Sangamon

Mostly clear with a slight chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Not as cool with Lows in the mid 50s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

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Illiopolis Temperature Statistics

March Temperature

Decatur Airport (19.3 miles)

  • Lowest 2 March, 2025

    16.8 °F

  • Average March

    44.3 °F

  • Highest 11 March, 2025

    73.9 °F

Climate (2020–Present)

Decatur Airport (19.3 miles)

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  • Average Low 2020–2025

    44.9 °F

  • Average 2020–2025

    54.8 °F

  • Average High 2020–2025

    64.5 °F
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