Hermiston Weather Forecast

    • 62
    • 86

    Partly Sunny

    • 60
    • 89

    Becoming Sunny

    • 61
    • 90

    Sunny

    • 57
    • 90

    Sunny

    • 58
    • 91

    Sunny

    • 61
    • 97

    Hot

    • 63
    • 99

    Hot

Today 17 Aug Lower Columbia Basin of Oregon

Sunny. Highs in the lower to mid 80s. West wind 5 to 15 Mph.

Tonight 17 Aug Lower Columbia Basin of Oregon

Mostly cloudy. A 20 percent chance of Showers overnight. Lows in the lower to mid 60s. West wind 5 to 10 Mph. Gusts up to 20 Mph overnight.

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Hermiston Temperature Statistics

August Temperature

Hermiston, Hermiston Municipal Airport (1.2 miles)

  • Lowest 8 August, 2025

    48.7 °F

  • Average August

    76.7 °F

  • Highest 11 August, 2025

    102.7 °F

Climate (2020–Present)

Hermiston, Hermiston Municipal Airport (1.2 miles)

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  • Average Low 2020–2025

    42.8 °F

  • Average 2020–2025

    55.1 °F

  • Average High 2020–2025

    67.5 °F
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