Cathlamet Weather Forecast

    • 47
    • 62

    Increasing Clouds

    • 48
    • 61

    Mostly Cloudy

    • 47
    • 66

    Partly Sunny

    • 50
    • 74

    Partly Sunny

    • 49
    • 68

    Partly Sunny

    • 46
    • 65

    Partly Sunny

    • 46
    • 63

    Mostly Cloudy

Today 18 May Willapa and Wahkiakum Lowlands

Sunny. Highs in the lower 60s. West wind 5 to 10 Mph.

Tonight 18 May Willapa and Wahkiakum Lowlands

Mostly cloudy. Lows in the upper 40s. West wind 5 to 10 Mph.

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Cathlamet Temperature Statistics

May Temperature

Southwest Washington Regional Airport (23.6 miles)

  • Lowest 9 May, 2026

    44.1 °F

  • Average May

    59.5 °F

  • Highest 3 May, 2026

    91 °F

Climate (2021–Present)

Southwest Washington Regional Airport (23.6 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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