Umatilla National Forest Rainfall Forecast

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Umatilla National Forest Rainfall Statistics

September Rainfall

Grant County Regional Airport (35.4 miles)

  • Total Rainfall September

    1in

  • Daily Average September

    0.1in

  • Wettest Day 10 September, 2025

    0.8in

  • Wet Days September

    3/15 (20%)

Climate (2010–Present)

Grant County Regional Airport (35.4 miles)

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  • Annual Average 2020–2024

    14.6in

  • Monthly Average 2020–2025

    1.3in

  • Daily Average 2020–2025

    0.04in

  • Wettest Day 21 July, 2025

    1.1in
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