Monticello Weather Forecast

    • 72
    • 90

    Mostly Sunny

    • 71
    • 89

    Mostly Sunny

    • 72
    • 88

    Slight Chance Thunderstorms

    • 70
    • 89

    Chance Thunderstorms

    • 70
    • 87

    Chance Thunderstorms

    • 68
    • 85

    Chance Thunderstorms

Today 8 Aug Piatt

Sunny. Near steady temperature in the upper 80s. South Winds 10 to 15 Mph.

Tonight 8 Aug Piatt

Mostly clear. Humid with Lows in the lower 70s. South Winds 5 to 10 Mph.

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Monticello Temperature Statistics

August Temperature

University of Illinois - Willard (15.5 miles)

  • Lowest 2 August, 2025

    57.7 °F

  • Average August

    71.8 °F

  • Highest 6 August, 2025

    87.1 °F

Climate (2020–Present)

University of Illinois - Willard (15.5 miles)

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  • Average Low 2020–2025

    44.2 °F

  • Average 2020–2025

    54.4 °F

  • Average High 2020–2025

    64.7 °F
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