Monticello Weather Forecast

    • 36
    • 48

    Mostly Cloudy

    • 21
    • 42

    Chance Rain

    • 24
    • 34

    Partly Sunny

    • 31
    • 44

    Partly Sunny

    • 32
    • 50

    Chance Rain

    • 18
    • 38

    Slight Chance Rain/Snow

    • 22
    • 31

    Mostly Cloudy

Today 9 Jan Piatt

Mostly cloudy. Cooler with Highs in the upper 40s. North Winds 5 to 10 Mph.

Tonight 9 Jan Piatt

Mostly cloudy. A slight chance of rain after midnight. Lows in the mid 30s. East Winds around 5 Mph. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Monticello Temperature Statistics

January Temperature

University of Illinois - Willard (15.5 miles)

  • Lowest 1 January, 2026

    19 °F

  • Average January

    33.4 °F

  • Highest 7 January, 2026

    51.1 °F

Climate (2021–Present)

University of Illinois - Willard (15.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    44.2 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    64.8 °F
Get WillyWeather+ to remove ads