Janesville Weather Forecast

    • 51
    • 69

    Chance Thunderstorms

    • 62
    • 74

    Rain Showers Likely

    • 63
    • 80

    Thunderstorms Likely

    • 66
    • 86

    Mostly Sunny

    • 70
    • 86

    Chance Thunderstorms

    • 63
    • 84

    Rain Showers Likely

    • 56
    • 77

    Chance Rain Showers

Today 14 May Cumberland

Sunny. Near steady temperature in the upper 60s. Southeast Winds around 5 Mph.

Tonight 14 May Cumberland

Mostly clear this Evening, then becoming mostly cloudy. Lows in the lower 50s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Janesville Temperature Statistics

May Temperature

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

  • Lowest 7 May, 2026

    38.6 °F

  • Average May

    56.5 °F

  • Highest 12 May, 2026

    77 °F

Climate (2021–Present)

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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