McCormack Slough Weather Forecast

    • 60
    • 74

    Gradual Clearing

    • 58
    • 82

    Sunny

    • 60
    • 87

    Sunny

    • 65
    • 94

    Sunny

    • 68
    • 98

    Hot

    • 68
    • 95

    Mostly Sunny

Today 4 Jul Lower Columbia Basin of Oregon

Mostly cloudy. A chance of rain Showers. Highs in the upper 70s. West wind 5 to 15 Mph. Chance of precipitation 40 percent. Rainfall Amounts less than a tenth of an inch.

Tonight 4 Jul Lower Columbia Basin of Oregon

Mostly cloudy. A 20 percent chance of rain Showers in the evening. Lows in the upper 50s to lower 60s. Breezy. Southwest wind 10 to 20 Mph with Gusts to around 30 Mph.

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  • Temperature Real-Time

McCormack Slough Temperature Statistics

July Temperature

Hermiston, Hermiston Municipal Airport (16.2 miles)

  • Lowest 1 July, 2025

    60.1 °F

  • Average July

    83.6 °F

  • Highest 1 July, 2025

    102 °F

Climate (2020–Present)

Hermiston, Hermiston Municipal Airport (16.2 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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