Illiopolis Weather Forecast

    • 39
    • 70

    Increasing Clouds

    • 31
    • 58

    Rain Likely

    • 22
    • 39

    Slight Chance Snow

    • 24
    • 39

    Mostly Sunny

    • 39
    • 53

    Partly Sunny

    • 33
    • 59

    Mostly Sunny

    • 36
    • 58

    Partly Sunny

Today 7 Nov Sangamon

Sunny. Highs in the upper 60s. Temperature falling into the mid 60s late. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 7 Nov Sangamon

Mostly clear. Cooler with Lows in the upper 30s. Northwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Illiopolis Temperature Statistics

November Temperature

Decatur Airport (19.3 miles)

  • Lowest 2 November, 2025

    27 °F

  • Average November

    47.5 °F

  • Highest 5 November, 2025

    66.9 °F

Climate (2020–Present)

Decatur Airport (19.3 miles)

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  • Average Low 2020–2025

    45.4 °F

  • Average 2020–2025

    55.4 °F

  • Average High 2020–2025

    65.3 °F
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