Illiopolis Weather Forecast

    • 62
    • 83

    Becoming Sunny

    • 63
    • 84

    Mostly Sunny

    • 67
    • 85

    Rain Showers Likely

    • 66
    • 82

    Slight Chance Thunderstorms

    • 68
    • 84

    Chance Rain Showers

    • 69
    • 86

    Slight Chance Thunderstorms

Today 3 Aug Sangamon

Patchy fog in the morning. Mostly sunny. Highs in the lower 80s. Northeast Winds around 5 Mph.

Tonight 3 Aug Sangamon

Mostly clear. Lows in the lower 60s. Southeast Winds around 5 Mph.

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Illiopolis Temperature Statistics

August Temperature

Decatur Airport (19.3 miles)

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  • Average August

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Climate (2021–2026)

Decatur Airport (19.3 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    65.6 °F
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