Plymouth Weather Forecast

    • 58
    • 90

    Sunny

    • 59
    • 90

    Sunny

    • 58
    • 93

    Sunny

    • 62
    • 96

    Sunny

    • 58
    • 93

    Breezy

    • 55
    • 86

    Sunny

Today 28 Jul Lower Columbia Basin of Washington

Sunny. Patchy smoke in the afternoon. Highs in the upper 80s to lower 90s. Southwest wind 5 to 15 Mph with Gusts to around 25 Mph.

Tonight 28 Jul Lower Columbia Basin of Washington

Clear. Lows in the mid to upper 50s. West wind 5 to 15 Mph with Gusts to around 25 Mph.

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Plymouth Temperature Statistics

July Temperature

Hermiston, Hermiston Municipal Airport (8.1 miles)

  • Lowest 5 July, 2026

    51.7 °F

  • Average July

    77.3 °F

  • Highest 15 July, 2026

    102.7 °F

Climate (2021–2026)

Hermiston, Hermiston Municipal Airport (8.1 miles)

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  • Average Low 2021–2026

    42.9 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    67.6 °F
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