Illiopolis Weather Forecast

    • 61
    • 83

    Mostly Sunny

    • 69
    • 85

    Chance Rain Showers

    • 70
    • 83

    Rain Showers Likely

    • 72
    • 86

    Chance Thunderstorms

    • 72
    • 89

    Slight Chance Thunderstorms

    • 73
    • 90

    Chance Thunderstorms

    • 70
    • 90

    Chance Thunderstorms

Today 26 Jul Sangamon

Sunny. Near steady temperature in the lower 80s. East Winds around 5 Mph.

Tonight 26 Jul Sangamon

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

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Illiopolis Temperature Statistics

July Temperature

Decatur Airport (19.3 miles)

  • Lowest 1 July, 2024

    49.6 °F

  • Average July

    75.6 °F

  • Highest 15 July, 2024

    94.6 °F

Climate (2019–Present)

Decatur Airport (19.3 miles)

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  • Average Low 2019–2024

    44.9 °F

  • Average 2019–2024

    54.6 °F

  • Average High 2019–2024

    64.1 °F
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