Janesville Weather Forecast

    • 61
    • 86

    Becoming Sunny

    • 61
    • 83

    Sunny

    • 65
    • 86

    Partly Sunny

    • 66
    • 83

    Rain Showers Likely

    • 65
    • 79

    Rain Showers Likely

    • 65
    • 82

    Slight Chance Thunderstorms

Today 28 Jul Cumberland

Mostly sunny. Near steady temperature in the mid 80s. North Winds around 10 Mph.

Tonight 28 Jul Cumberland

Partly cloudy in the Evening, then becoming mostly clear. Cooler with Lows in the lower 60s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Janesville Temperature Statistics

July Temperature

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

  • Lowest 23 July, 2026

    52.6 °F

  • Average July

    76.8 °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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