Cowlitz River - Longview Weather Forecast

    • 54
    • 68

    Chance Rain

    • 55
    • 71

    Mostly Cloudy

    • 57
    • 77

    Mostly Cloudy

    • 57
    • 72

    Rain Likely

    • 56
    • 63

    Rain

    • 55
    • 65

    Rain Likely

Today 29 Aug Cowlitz County Lowlands

Partly sunny with a 50 percent chance of rain. Highs around 70. West wind 5 to 10 Mph. Rainfall Amounts less than a tenth of an inch.

Tonight 29 Aug Cowlitz County Lowlands

Partly cloudy in the Evening, then becoming mostly cloudy. Patchy fog after midnight. Lows in the lower 50s. West wind 5 to 10 Mph in the Evening, becoming light and variable.

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Cowlitz River - Longview Temperature Statistics

August Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 9 August, 2026

    54 °F

  • Average August

    67.7 °F

  • Highest 5 August, 2026

    93.9 °F

Climate (2021–2026)

Southwest Washington Regional Airport (2.5 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.5 °F
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