Illiopolis Weather Forecast

    • 2
    • 16

    Partly Sunny

    • 0
    • 20

    Partly Sunny

    • 15
    • 24

    Chance Snow

    • 16
    • 30

    Mostly Cloudy

    • 19
    • 30

    Chance Snow

    • 17
    • 29

    Chance Snow

Today 30 Jan Sangamon

Mostly sunny. Highs around 16. North Winds 10 to 15 Mph. Wind chill Values as low as 13 below in the morning.

Tonight 30 Jan Sangamon

Partly cloudy and cold. Near steady temperature around zero. North Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Illiopolis Temperature Statistics

January Temperature

Decatur Airport (19.3 miles)

  • Lowest 26 January, 2026

    -5.1 °F

  • Average January

    28 °F

  • Highest 8 January, 2026

    63.6 °F

Climate (2021–Present)

Decatur Airport (19.3 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    65.2 °F
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