Illiopolis Weather Forecast

    • 55
    • 80

    Severe Tstms

    • 33
    • 67

    Slight Chance Rain Showers

    • 34
    • 47

    Mostly Sunny

    • 49
    • 65

    Mostly Sunny

    • 52
    • 73

    Mostly Cloudy

    • 34
    • 67

    Rain Likely

Today 14 Mar Sangamon

Mostly sunny and very windy. Highs around 80. South Winds 20 to 25 Mph with Gusts up to 35 Mph, increasing to 25 to 35 Mph with Gusts up to 50 Mph this afternoon.

Tonight 14 Mar Sangamon

A chance of Thunderstorms. Showers. Some Thunderstorms may be severe. Very windy with Lows in the mid 50s. South Winds 25 to 35 Mph with Gusts up to 50 Mph, Diminishing to 20 to 25 Mph with Gusts up to 40 Mph after midnight. Chance of rain near 100 percent.

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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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