Illiopolis Weather Forecast

    • 0
    • 6

    Cold

    • 8
    • 11

    Snow

    • -2
    • 14

    Snow Likely

    • 2
    • 12

    Mostly Sunny

    • 9
    • 25

    Mostly Cloudy

    • 1
    • 20

    Partly Sunny

Today 23 Jan Sangamon

Partly sunny. Much cooler with Highs around 6 above. North Winds 15 to 20 Mph. Wind chill Values as low as 22 below.

Tonight 23 Jan Sangamon

Mostly cloudy and cold. Near steady temperature around 1 above. Northeast Winds around 10 Mph with Gusts up to 20 Mph. Wind chill Values as low as 17 below.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Illiopolis Temperature Statistics

January Temperature

Decatur Airport (19.3 miles)

  • Lowest 19 January, 2026

    5 °F

  • Average January

    32 °F

  • Highest 8 January, 2026

    63 °F

Climate (2021–Present)

Decatur Airport (19.3 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    55.3 °F

  • Average High 2021–2026

    65.2 °F
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