Illinois Natural History Survey Area Weather Forecast

    • 68
    • 97

    Hot

    • 63
    • 86

    Mostly Sunny

    • 64
    • 86

    Mostly Sunny

    • 73
    • 93

    Mostly Sunny

    • 68
    • 97

    Slight Chance Thunderstorms

    • 63
    • 87

    Slight Chance Thunderstorms

Today 5 Sep Moultrie

Sunny, hot with Highs in the mid 90s. Northwest Winds 5 to 10 Mph. Heat index Values up to 105.

Tonight 5 Sep Moultrie

Mostly clear in the Evening, then becoming partly cloudy. Humid with Lows in the upper 60s. Northeast Winds 5 to 10 Mph.

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Illinois Natural History Survey Area Temperature Statistics

September Temperature

Mattoon / Charleston, Coles County Memorial Airport (16.8 miles)

  • Lowest 1 September, 2026

    74.6 °F

  • Average September

    85.3 °F

  • Highest 2 September, 2026

    97 °F

Climate (2021–2026)

Mattoon / Charleston, Coles County Memorial Airport (16.8 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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