Lake Mattoon Weather Forecast

    • 63
    • 80

    Chance Rain Showers

    • 64
    • 83

    Rain Showers

    • 65
    • 78

    Rain Showers

    • 69
    • 83

    Chance Thunderstorms

    • 72
    • 89

    Mostly Sunny

    • 73
    • 92

    Sunny

Today 24 Jun Shelby

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs around 80. South Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 24 Jun Shelby

Mostly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then partly cloudy with a chance of Showers after midnight. Lows in the lower 60s. Southwest Winds 5 to 10 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mattoon Temperature Statistics

June Temperature

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

  • Lowest 3 June, 2026

    54.6 °F

  • Average June

    71.9 °F

  • Highest 9 June, 2026

    89.7 °F

Climate (2021–2026)

Mattoon / Charleston, Coles County Memorial Airport (13 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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