Knappa Slough - Knappa Weather Forecast

    • 55
    • 76

    Increasing Clouds

    • 53
    • 67

    Increasing Clouds

    • 52
    • 68

    Partly Sunny

    • 53
    • 70

    Partly Sunny

    • 55
    • 65

    Mostly Cloudy

    • 51
    • 63

    Mostly Cloudy

    • 53
    • 65

    Mostly Cloudy

Today 17 Sep North Oregon Coast Range Lowlands

Partly sunny. Highs in the lower 70s.

Tonight 17 Sep North Oregon Coast Range Lowlands

Mostly clear this Evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the lower 50s. Winds light.

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Knappa Slough - Knappa Temperature Statistics

September Temperature

Astoria, Astoria Regional Airport (13.7 miles)

  • Lowest 8 September, 2026

    48.7 °F

  • Average September

    60.2 °F

  • Highest 9 September, 2026

    77.6 °F

Climate (2021–2026)

Astoria, Astoria Regional Airport (13.7 miles)

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    52.7 °F

  • Average High 2021–2026

    59.9 °F
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