Williamson Airport Weather Forecast

    • 75
    • 91

    Becoming Sunny

    • 75
    • 92

    Chance Thunderstorms

    • 73
    • 89

    Chance Thunderstorms

    • 72
    • 88

    Chance Thunderstorms

    • 72
    • 89

    Slight Chance Thunderstorms

    • 72
    • 90

    Mostly Sunny

Today 23 Jul Cumberland

Mostly sunny. Humid with Highs in the lower 90s. South Winds around 5 Mph. Heat index Values up to 104.

Tonight 23 Jul Cumberland

Mostly clear. Near steady temperature in the mid 70s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Williamson Airport Temperature Statistics

July Temperature

Mattoon / Charleston, Coles County Memorial Airport (13 miles)

  • Lowest 8 July, 2025

    64.7 °F

  • Average July

    77.8 °F

  • Highest 6 July, 2025

    90.6 °F

Climate (2020–Present)

Mattoon / Charleston, Coles County Memorial Airport (13 miles)

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  • Average Low 2020–2025

    45.7 °F

  • Average 2020–2025

    55 °F

  • Average High 2020–2025

    64.4 °F
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