Illiopolis Weather Forecast

    • 44
    • 58

    Rain

    • 42
    • 58

    Slight Chance Rain

    • 43
    • 56

    Chance Rain

    • 47
    • 63

    Rain Likely

    • 36
    • 56

    Rain Likely

    • 35
    • 52

    Partly Sunny

    • 39
    • 56

    Partly Sunny

Today 17 Nov Sangamon

Mostly sunny. Near steady temperature in the mid 50s. Southeast Winds 10 to 15 Mph.

Tonight 17 Nov Sangamon

A slight chance of Thunderstorms. Rain likely. Not as cool with Lows in the mid 40s. Southeast Winds 10 to 15 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

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Illiopolis Temperature Statistics

November Temperature

Decatur Airport (19.3 miles)

  • Lowest 11 November, 2025

    21.9 °F

  • Average November

    48.7 °F

  • Highest 14 November, 2025

    75.9 °F

Climate (2020–Present)

Decatur Airport (19.3 miles)

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  • Average Low 2020–2025

    45.4 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    65.2 °F
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