Lake Mattoon Weather Forecast

    • 48
    • 74

    Mostly Sunny

    • 54
    • 76

    Partly Sunny

    • 56
    • 80

    Mostly Sunny

    • 51
    • 77

    Mostly Sunny

    • 54
    • 76

    Partly Sunny

    • 56
    • 79

    Partly Sunny

Today 26 Aug Shelby

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph.

Tonight 26 Aug Shelby

Mostly clear. Lows in the upper 40s. North Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mattoon Temperature Statistics

August Temperature

Mattoon / Charleston, Coles County Memorial Airport (13 miles)

  • Lowest 3 August, 2025

    53.7 °F

  • Average August

    76.2 °F

  • Highest 16 August, 2025

    94.6 °F

Climate (2020–Present)

Mattoon / Charleston, Coles County Memorial Airport (13 miles)

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    55.1 °F

  • Average High 2020–2025

    64.5 °F
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