Columbia River - Trojan Nuclear Plant Weather Forecast

    • 46
    • 64

    Chance Rain

    • 44
    • 58

    Rain

    • 41
    • 57

    Rain Showers

    • 43
    • 65

    Mostly Cloudy

    • 46
    • 68

    Mostly Cloudy

    • 47
    • 70

    Partly Sunny

    • 49
    • 74

    Partly Sunny

Today 14 May Lower Columbia River

Mostly cloudy with a 50 percent chance of rain. Highs in the mid 60s. West wind 5 to 10 Mph. Rainfall Amounts less than a tenth of an inch.

Tonight 14 May Lower Columbia River

Mostly cloudy with a slight chance of rain this Evening, then partly cloudy after midnight. Lows in the mid 40s. Winds light. Chance of rain 20 percent.

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Columbia River - Trojan Nuclear Plant Temperature Statistics

May Temperature

Southwest Washington Regional Airport (5 miles)

  • Lowest 9 May, 2026

    44.1 °F

  • Average May

    62 °F

  • Highest 3 May, 2026

    91 °F

Climate (2021–Present)

Southwest Washington Regional Airport (5 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.5 °F
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