Columbia River - Kalama River Entrance Weather Forecast

    • 53
    • 72

    Mostly Cloudy

    • 55
    • 73

    Partly Sunny

    • 53
    • 71

    Partly Sunny

    • 56
    • 76

    Partly Sunny

    • 59
    • 84

    Mostly Sunny

    • 57
    • 80

    Partly Sunny

Today 5 Sep Cowlitz County Lowlands

Partly sunny. Patchy fog this morning. A slight chance of Thunderstorms this afternoon. Highs in the lower 70s. Light and variable Winds, becoming light this afternoon. Chance of precipitation 20 percent.

Tonight 5 Sep Cowlitz County Lowlands

Mostly cloudy in the Evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the lower 50s. Winds light.

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Columbia River - Kalama River Entrance Temperature Statistics

September Temperature

Southwest Washington Regional Airport (5.6 miles)

  • Lowest 3 September, 2026

    51.1 °F

  • Average September

    59.9 °F

  • Highest 1 September, 2026

    66 °F

Climate (2021–2026)

Southwest Washington Regional Airport (5.6 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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