Illiopolis Weather Forecast

    • 58
    • 76

    Increasing Clouds

    • 37
    • 74

    Partly Sunny

    • 31
    • 55

    Mostly Sunny

    • 40
    • 55

    Rain Likely

    • 35
    • 52

    Slight Chance Rain

    • 42
    • 54

    Rain Likely

    • 42
    • 59

    Rain Likely

Today 14 Nov Sangamon

Sunny. Not as cool with Highs in the upper 70s. Southwest Winds 10 to 15 Mph.

Tonight 14 Nov Sangamon

Mostly clear in the Evening, then becoming mostly cloudy. Not as cool with Lows in the upper 50s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Illiopolis Temperature Statistics

November Temperature

Decatur Airport (19.3 miles)

  • Lowest 11 November, 2025

    21.9 °F

  • Average November

    46.2 °F

  • Highest 7 November, 2025

    69.1 °F

Climate (2020–Present)

Decatur Airport (19.3 miles)

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  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    65.2 °F
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