Janesville Weather Forecast

    • 12
    • 32

    Slight Chance Snow

    • -1
    • 14

    Partly Sunny

    • 0
    • 14

    Mostly Sunny

    • 0
    • 10

    Cold

    • 19
    • 24

    Mostly Cloudy

    • 17
    • 33

    Mostly Cloudy

Today 18 Jan Cumberland

Mostly cloudy. A chance of rain with a slight chance of snow in the morning. Cooler with Highs in the lower 30s. Temperature falling into the upper 20s in the afternoon. North Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation 40 percent.

Tonight 18 Jan Cumberland

Mostly cloudy. Much cooler with Lows around 13. North Winds around 15 Mph with Gusts up to 25 Mph. Wind chill Values as low as 2 below.

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  • Temperature Real-Time

Janesville Temperature Statistics

January Temperature

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

  • Lowest 15 January, 2025

    -2.9 °F

  • Average January

    21.9 °F

  • Highest 2 January, 2025

    41.6 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    54.9 °F

  • Average High 2020–2025

    64.2 °F
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