Illiopolis Weather Forecast

    • 48
    • 52

    Rain

    • 33
    • 56

    Chance Rain

    • 23
    • 41

    Breezy

    • 17
    • 36

    Mostly Sunny

    • 26
    • 35

    Rain/Snow Likely

    • 29
    • 37

    Rain/Snow Likely

    • 27
    • 41

    Chance Rain

Today 24 Nov Sangamon

Cloudy with a 40 percent chance of rain. Near steady temperature around 50. Southeast Winds around 10 Mph.

Tonight 24 Nov Sangamon

Rain. Patchy fog. Not as cool. Near steady temperature in the upper 40s. Southeast Winds 5 to 10 Mph. Chance of rain 90 percent.

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Illiopolis Temperature Statistics

November Temperature

Decatur Airport (19.3 miles)

  • Lowest 11 November, 2025

    21.9 °F

  • Average November

    47.8 °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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