Plymouth Weather Forecast

    • 36
    • 64

    Mostly Sunny

    • 42
    • 66

    Partly Sunny

    • 44
    • 68

    Partly Sunny

    • 42
    • 68

    Partly Sunny

    • 45
    • 72

    Mostly Sunny

    • 47
    • 76

    Mostly Sunny

Today 25 Apr Lower Columbia Basin of Washington

Sunny. Highs in the lower to mid 60s. Northwest wind 5 to 10 Mph.

Tonight 25 Apr Lower Columbia Basin of Washington

Mostly clear. Lows in the mid to upper 30s. North wind 5 to 10 Mph.

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Plymouth Temperature Statistics

April Temperature

Hermiston, Hermiston Municipal Airport (8.1 miles)

  • Lowest 18 April, 2026

    30 °F

  • Average April

    52.1 °F

  • Highest 6 April, 2026

    78.7 °F

Climate (2021–Present)

Hermiston, Hermiston Municipal Airport (8.1 miles)

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  • Average Low 2021–2026

    43.1 °F

  • Average 2021–2026

    55.4 °F

  • Average High 2021–2026

    67.7 °F
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