McCormack Slough Weather Forecast

    • 49
    • 65

    Slight Chance Rain Showers

    • 52
    • 67

    Increasing Clouds

    • 48
    • 67

    Rain Showers Likely

    • 45
    • 65

    Partly Sunny

    • 49
    • 69

    Mostly Sunny

    • 46
    • 71

    Mostly Sunny

    • 49
    • 72

    Partly Sunny

Today 15 May Lower Columbia Basin of Oregon

Mostly cloudy. Highs in the mid to upper 60s. Breezy. Southwest wind 10 to 20 Mph with Gusts to around 30 Mph.

Tonight 15 May Lower Columbia Basin of Oregon

Mostly cloudy with a 50 percent chance of rain Showers. Lows in the mid to upper 40s. Windy. Southwest wind 15 to 25 Mph. Rainfall Amounts less than a tenth of an inch.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

McCormack Slough Temperature Statistics

May Temperature

Hermiston, Hermiston Municipal Airport (16.2 miles)

  • Lowest 6 May, 2025

    31.7 °F

  • Average May

    58.9 °F

  • Highest 2 May, 2025

    87.7 °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

    67.3 °F
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