Johnstown Weather Forecast

    • 54
    • 83

    Rain Showers

    • 54
    • 74

    Mostly Sunny

    • 48
    • 77

    Mostly Sunny

    • 48
    • 74

    Mostly Sunny

    • 51
    • 76

    Mostly Sunny

    • 55
    • 76

    Partly Sunny

Today 3 Sep Cumberland

Sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs in the mid 80s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 3 Sep Cumberland

Showers with a chance of Thunderstorms in the Evening, then Showers likely after midnight. Lows in the mid 50s. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of rain 80 percent.

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Johnstown Temperature Statistics

September Temperature

Mattoon / Charleston, Coles County Memorial Airport (7.5 miles)

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  • Average September

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Climate (2020–Present)

Mattoon / Charleston, Coles County Memorial Airport (7.5 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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