Monticello Weather Forecast

    • 71
    • 87

    Chance Thunderstorms

    • 65
    • 84

    Rain Showers

    • 65
    • 83

    Mostly Sunny

    • 72
    • 87

    Mostly Sunny

    • 75
    • 93

    Mostly Sunny

    • 74
    • 93

    Mostly Sunny

Today 17 Jun Piatt

Mostly sunny. Highs in the upper 80s. Southwest Winds around 10 Mph.

Tonight 17 Jun Piatt

Partly cloudy in the Evening, then becoming mostly cloudy. A slight chance of Showers and Thunderstorms. Lows in the lower 70s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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Monticello Temperature Statistics

June Temperature

University of Illinois - Willard (15.5 miles)

  • Lowest 1 June, 2025

    48.7 °F

  • Average June

    70.7 °F

  • Highest 3 June, 2025

    92.6 °F

Climate (2020–Present)

University of Illinois - Willard (15.5 miles)

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  • Average Low 2020–2025

    44.1 °F

  • Average 2020–2025

    54.2 °F

  • Average High 2020–2025

    64.5 °F
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