Columbia River - Barlow Point Weather Forecast

    • 52
    • 69

    Decreasing Clouds

    • 55
    • 76

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 53
    • 72

    Partly Sunny

    • 52
    • 67

    Mostly Cloudy

    • 52
    • 69

    Slight Chance Rain

Today 7 Sep Cowlitz County Lowlands

Mostly cloudy this Morning, then becoming mostly sunny. Patchy fog this morning. Highs around 70. Winds light.

Tonight 7 Sep Cowlitz County Lowlands

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 50s. Winds light.

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Columbia River - Barlow Point Temperature Statistics

September Temperature

Southwest Washington Regional Airport (6.8 miles)

  • Lowest 4 September, 2026

    48 °F

  • Average September

    59.4 °F

  • Highest 5 September, 2026

    73.9 °F

Climate (2021–2026)

Southwest Washington Regional Airport (6.8 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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