Janesville Weather Forecast

    • 56
    • 76

    Becoming Sunny

    • 59
    • 77

    Mostly Sunny

    • 61
    • 77

    Partly Sunny

    • 66
    • 83

    Mostly Sunny

    • 73
    • 91

    Mostly Sunny

    • 70
    • 93

    Slight Chance Thunderstorms

Today 22 Jul Cumberland

Mostly sunny. Cooler with Highs in the mid 70s. North Winds 5 to 10 Mph.

Tonight 22 Jul Cumberland

Mostly clear. Lows in the mid 60s. North Winds 5 to 10 Mph.

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  • Temperature Real-Time

Janesville Temperature Statistics

July Temperature

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

  • Lowest 13 July, 2026

    63.6 °F

  • Average July

    78.8 °F

  • Highest 2 July, 2026

    92.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    55.4 °F

  • Average High 2021–2026

    65 °F
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