O'Brien Weather Forecast

    • 53
    • 74

    Increasing Clouds

    • 54
    • 74

    Partly Sunny

    • 54
    • 75

    Mostly Sunny

    • 54
    • 72

    Mostly Cloudy

    • 53
    • 70

    Mostly Cloudy

    • 53
    • 69

    Mostly Cloudy

    • 54
    • 71

    Mostly Cloudy

Today 18 Sep Lowlands of Pierce and Southern King Counties

Sunny. Highs in the mid 60s to lower 70s. South wind to 10 Mph becoming southwest in the afternoon.

Tonight 18 Sep Lowlands of Pierce and Southern King Counties

Partly cloudy. Lows in the upper 40s to mid 50s. West wind to 10 Mph becoming southwest after midnight.

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O'Brien Temperature Statistics

September Temperature

Seattle, Seattle-Tacoma International Airport (3.7 miles)

  • Lowest 5 September, 2026

    52.6 °F

  • Average September

    62.4 °F

  • Highest 9 September, 2026

    78.7 °F

Climate (2021–2026)

Seattle, Seattle-Tacoma International Airport (3.7 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    53.5 °F

  • Average High 2021–2026

    61.3 °F
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