Sullivan Weather Forecast

    • 70
    • 87

    Chance Thunderstorms

    • 71
    • 87

    Rain Showers Likely

    • 70
    • 89

    Slight Chance Thunderstorms

    • 73
    • 90

    Mostly Sunny

    • 69
    • 90

    Partly Sunny

    • 63
    • 83

    Partly Sunny

Today 12 Aug Moultrie

Partly sunny with a chance of Showers. A slight chance of Thunderstorms in the Morning, then a chance of Thunderstorms in the afternoon. Humid with Highs in the upper 80s. South Winds around 5 Mph, becoming east in the afternoon. Chance of rain 50 percent.

Tonight 12 Aug Moultrie

Partly cloudy. Near steady temperature in the mid 70s. Southwest Winds 5 to 10 Mph.

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Sullivan Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2026

    61.6 °F

  • Average August

    75.5 °F

  • Highest 8 August, 2026

    88.6 °F

Climate (2021–2026)

Mattoon / Charleston, Coles County Memorial Airport (19.3 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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