Janesville Weather Forecast

    • 22
    • 32

    Decreasing Clouds

    • 24
    • 36

    Mostly Cloudy

    • 21
    • 37

    Partly Sunny

    • 29
    • 37

    Partly Sunny

    • 35
    • 49

    Partly Sunny

    • 33
    • 53

    Mostly Cloudy

Today 1 Jan Cumberland

Partly cloudy. Highs in the mid 30s. Lows around 20.

Tonight 1 Jan Cumberland

Mostly cloudy. Lows in the mid 20s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Janesville Temperature Statistics

January Temperature

Mattoon / Charleston, Coles County Memorial Airport (6.8 miles)

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  • Average January

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Climate (2021–Present)

Mattoon / Charleston, Coles County Memorial Airport (6.8 miles)

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  • Average Low 2021–2025

    45.8 °F

  • Average 2021–2025

    55.2 °F

  • Average High 2021–2025

    64.6 °F
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