Williamson Airport Rainfall Forecast

  • No Rain
  • 45%
  • 80%
  • 10%
  • 25%
  • 5%
  • 5%
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  • Rainfall Probability Forecast NOAA

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Williamson Airport Rainfall Statistics

September Rainfall

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

  • Total Rainfall September

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  • Daily Average September

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  • Wettest Day 3 September, 2025

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  • Wet Days September

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Climate (2010–Present)

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

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  • Annual Average 2020–2024

    36.6in

  • Monthly Average 2020–2025

    3.1in

  • Daily Average 2020–2025

    0.1in

  • Wettest Day 9 July, 2024

    3.6in
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