Monticello Weather Forecast

    • 50
    • 77

    Partly Sunny

    • 49
    • 76

    Mostly Cloudy

    • 51
    • 74

    Mostly Cloudy

    • 54
    • 77

    Mostly Sunny

    • 54
    • 80

    Partly Sunny

    • 56
    • 80

    Mostly Cloudy

    • 57
    • 74

    Rain Showers Likely

Today 25 Oct Piatt

Mostly cloudy. A chance of Showers in the morning. Highs in the lower 70s. Chance of rain 50 percent.

Tonight 25 Oct Piatt

Partly cloudy. Lows in the upper 40s. South Winds around 5 Mph.

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Monticello Temperature Statistics

October Temperature

University of Illinois - Willard (15.5 miles)

  • Lowest 18 October, 2026

    35.7 °F

  • Average October

    62.6 °F

  • Highest 13 October, 2026

    91.7 °F

Climate (2021–2026)

University of Illinois - Willard (15.5 miles)

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  • Average Low 2021–2026

    44.2 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    65.2 °F
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