Willapa Bay - Grassy Island Weather Forecast

    • 55
    • 65

    Mostly Cloudy

    • 58
    • 64

    Partly Sunny

    • 57
    • 63

    Mostly Cloudy

    • 57
    • 66

    Partly Sunny

    • 59
    • 71

    Partly Sunny

    • 58
    • 68

    Mostly Cloudy

Today 5 Sep South Washington Coast

Partly sunny this Morning, then mostly cloudy with a slight chance of Thunderstorms this afternoon. Highs in the upper 60s. Winds light. Chance of precipitation 20 percent.

Tonight 5 Sep South Washington Coast

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

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Willapa Bay - Grassy Island Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (23.6 miles)

  • Lowest 3 September, 2026

    54 °F

  • Average September

    61.4 °F

  • Highest 1 September, 2026

    66.7 °F

Climate (2021–2026)

Hoquiam, Bowerman Airport (23.6 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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