Illiopolis Weather Forecast

    • 45
    • 64

    Sunny

    • 43
    • 66

    Mostly Sunny

    • 39
    • 64

    Rain Likely

    • 30
    • 48

    Slight Chance Rain

    • 27
    • 43

    Mostly Sunny

    • 32
    • 49

    Mostly Sunny

Today 9 Nov Sangamon

Sunny. Highs in the mid 60s. Southwest Winds around 5 Mph.

Tonight 9 Nov Sangamon

Clear. Not as cool with Lows in the mid 40s. Southwest Winds around 5 Mph.

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Illiopolis Temperature Statistics

November Temperature

Decatur Airport (19.3 miles)

  • Lowest 7 November, 2026

    30 °F

  • Average November

    55.2 °F

  • Highest 3 November, 2026

    74.6 °F

Climate (2021–2026)

Decatur Airport (19.3 miles)

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  • Average Low 2021–2026

    45.4 °F

  • Average 2021–2026

    55.7 °F

  • Average High 2021–2026

    65.8 °F
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