Sullivan Weather Forecast

    • 66
    • 91

    Slight Chance Thunderstorms

    • 65
    • 93

    Mostly Sunny

    • 64
    • 92

    Mostly Sunny

    • 64
    • 92

    Mostly Sunny

    • 64
    • 92

    Partly Sunny

    • 62
    • 90

    Chance Rain Showers

Today 13 Sep Moultrie

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the lower 90s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 13 Sep Moultrie

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows in the mid 60s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sullivan Temperature Statistics

September Temperature

Mattoon / Charleston, Coles County Memorial Airport (19.3 miles)

  • Lowest 7 September, 2025

    45 °F

  • Average September

    65.1 °F

  • Highest 11 September, 2025

    86 °F

Climate (2020–Present)

Mattoon / Charleston, Coles County Memorial Airport (19.3 miles)

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  • Average Low 2020–2025

    45.7 °F

  • Average 2020–2025

    55.1 °F

  • Average High 2020–2025

    64.5 °F
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