Cowlitz River - Longview Weather Forecast

    • 43
    • 64

    Becoming Sunny

    • 47
    • 70

    Mostly Sunny

    • 54
    • 81

    Mostly Sunny

    • 57
    • 89

    Partly Sunny

    • 52
    • 72

    Mostly Cloudy

    • 49
    • 70

    Partly Sunny

Today 30 May Cowlitz County Lowlands

Partly sunny. Highs in the mid 60s. Northwest wind 5 to 10 Mph.

Tonight 30 May Cowlitz County Lowlands

Mostly clear. Lows in the lower 40s. Northwest wind 10 to 15 Mph, easing to light after midnight.

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Cowlitz River - Longview Temperature Statistics

May Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 17 May, 2026

    39.9 °F

  • Average May

    59.1 °F

  • Highest 3 May, 2026

    91 °F

Climate (2021–Present)

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

    62.6 °F
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