Cowlitz River - Kelso Weather Forecast

    • 56
    • 78

    Mostly Sunny

    • 54
    • 75

    Partly Sunny

    • 54
    • 77

    Partly Sunny

    • 59
    • 70

    Chance Rain Showers

    • 54
    • 70

    Chance Rain Showers

    • 55
    • 72

    Partly Sunny

Today 17 Sep Cowlitz County Lowlands

Sunny. Highs in the upper 70s. Northwest wind 5 to 10 Mph.

Tonight 17 Sep Cowlitz County Lowlands

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 50s. Northwest wind 5 to 10 Mph.

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Cowlitz River - Kelso Temperature Statistics

September Temperature

Southwest Washington Regional Airport (1.9 miles)

  • Lowest 14 September, 2025

    51.1 °F

  • Average September

    65.6 °F

  • Highest 2 September, 2025

    88 °F

Climate (2020–Present)

Southwest Washington Regional Airport (1.9 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.3 °F
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