Cowlitz River - Third Avenue Weather Forecast

    • 53
    • 69

    Partly Sunny

    • 51
    • 63

    Chance Rain

    • 51
    • 68

    Mostly Cloudy

    • 54
    • 71

    Mostly Cloudy

    • 51
    • 70

    Partly Sunny

    • 53
    • 73

    Mostly Sunny

Today 28 Sep Cowlitz County Lowlands

Mostly sunny. Highs in the upper 60s. Winds light.

Tonight 28 Sep Cowlitz County Lowlands

Mostly cloudy. A slight chance of rain after midnight. Lows in the lower 50s. Winds Light, becoming south 5 to 10 Mph after midnight. Chance of rain 20 percent.

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Cowlitz River - Third Avenue Temperature Statistics

September Temperature

Southwest Washington Regional Airport (1.2 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 (1.2 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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