Lake Mattoon Weather Forecast

    • 55
    • 77

    Thunderstorms Likely

    • 47
    • 65

    Mostly Cloudy

    • 44
    • 61

    Partly Sunny

    • 47
    • 65

    Partly Sunny

    • 49
    • 65

    Chance Rain Showers

    • 50
    • 67

    Chance Rain Showers

Today 20 May Shelby

Mostly cloudy. A chance of Showers and Thunderstorms this Morning, then Showers and Thunderstorms likely this afternoon. Highs in the upper 70s. Southeast Winds 15 to 20 Mph, becoming south 10 to 15 Mph this afternoon. Chance of rain 70 percent.

Tonight 20 May Shelby

Mostly cloudy. A chance of Showers and Thunderstorms in the evening. Lows in the mid 50s. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mattoon Temperature Statistics

May Temperature

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

  • Lowest 9 May, 2025

    44.7 °F

  • Average May

    63.1 °F

  • Highest 15 May, 2025

    86.6 °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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