Lake Mattoon Weather Forecast

    • 70
    • 87

    Thunderstorms Likely

    • 66
    • 84

    Chance Thunderstorms

    • 70
    • 87

    Slight Chance Thunderstorms

    • 68
    • 87

    Chance Thunderstorms

    • 68
    • 86

    Chance Thunderstorms

    • 70
    • 87

    Chance Thunderstorms

Today 6 Jul Shelby

Partly sunny. A slight chance of Showers and Thunderstorms in the Morning, then Thunderstorms likely with a chance of Showers in the afternoon. Humid with Highs in the upper 80s. Southwest Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 6 Jul Shelby

Mostly cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the mid 70s. South Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mattoon Temperature Statistics

July Temperature

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

  • Lowest 2 July, 2025

    64.9 °F

  • Average July

    77.1 °F

  • Highest 3 July, 2025

    87.1 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.7 °F

  • Average 2020–2025

    55 °F

  • Average High 2020–2025

    64.4 °F
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