Columbia River - Trojan Nuclear Plant Weather Forecast

    • 51
    • 70

    Increasing Clouds

    • 51
    • 63

    Chance Rain

    • 50
    • 69

    Partly Sunny

    • 53
    • 73

    Partly Sunny

    • 51
    • 70

    Partly Sunny

    • 52
    • 72

    Partly Sunny

Today 28 Sep Lower Columbia River

Mostly sunny. Highs in the lower 70s. Light and variable Winds, becoming light this afternoon.

Tonight 28 Sep Lower Columbia River

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 50. Winds light.

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Columbia River - Trojan Nuclear Plant Temperature Statistics

September Temperature

Southwest Washington Regional Airport (5 miles)

  • Lowest 26 September, 2026

    45 °F

  • Average September

    60.6 °F

  • Highest 9 September, 2026

    86 °F

Climate (2021–2026)

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

    62.4 °F
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