Illinois Natural History Survey Area Weather Forecast

    • 74
    • 88

    Chance Thunderstorms

    • 66
    • 91

    Chance Thunderstorms

    • 58
    • 78

    Mostly Sunny

    • 61
    • 79

    Partly Sunny

    • 63
    • 80

    Slight Chance Rain Showers

    • 66
    • 85

    Mostly Sunny

Today 20 Jul Moultrie

Mostly sunny. Patchy smoke. Highs in the upper 80s. Southeast Winds around 5 Mph, becoming southwest this afternoon.

Tonight 20 Jul Moultrie

Patchy smoke in the evening. Mostly clear in the Evening, then partly cloudy with a chance of Showers and Thunderstorms after midnight. Humid with Lows in the lower 70s. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent.

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Illinois Natural History Survey Area Temperature Statistics

July Temperature

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

  • Lowest 13 July, 2026

    63.6 °F

  • Average July

    78.9 °F

  • Highest 2 July, 2026

    92.6 °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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