Plymouth Weather Forecast

    • 53
    • 83

    Sunny

    • 54
    • 88

    Sunny

    • 55
    • 87

    Mostly Sunny

    • 57
    • 87

    Partly Sunny

    • 59
    • 84

    Partly Sunny

    • 52
    • 81

    Mostly Sunny

Today 16 Sep Lower Columbia Basin of Washington

Sunny. Highs in the lower 80s. Northeast wind 5 to 10 Mph.

Tonight 16 Sep Lower Columbia Basin of Washington

Clear. Lows in the lower to mid 50s. Northeast wind 5 to 10 Mph in the Evening, becoming light.

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Plymouth Temperature Statistics

September Temperature

Hermiston, Hermiston Municipal Airport (8.1 miles)

  • Lowest 13 September, 2025

    54 °F

  • Average September

    73.6 °F

  • Highest 2 September, 2025

    98.1 °F

Climate (2020–Present)

Hermiston, Hermiston Municipal Airport (8.1 miles)

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  • Average Low 2020–2025

    42.9 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    67.6 °F
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