Copalis River Mouth Weather Forecast

    • 55
    • 62

    Mostly Cloudy

    • 52
    • 63

    Partly Sunny

    • 54
    • 65

    Mostly Sunny

    • 55
    • 66

    Partly Sunny

    • 56
    • 65

    Mostly Cloudy

    • 55
    • 63

    Mostly Cloudy

Today 14 Sep Grays Harbor County Coast

Partly sunny. Patchy fog in the morning. Highs in the 60s. Light wind becoming southwest to 10 Mph in the afternoon.

Tonight 14 Sep Grays Harbor County Coast

Mostly cloudy. Lows in the upper 40s to mid 50s. Light wind.

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Copalis River Mouth Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (16.8 miles)

  • Lowest 8 September, 2026

    48.7 °F

  • Average September

    60.9 °F

  • Highest 9 September, 2026

    73.7 °F

Climate (2021–2026)

Hoquiam, Bowerman Airport (16.8 miles)

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  • Average Low 2021–2026

    46.3 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    58.6 °F
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