Howard A Hanson Reservoir Weather Forecast

    • 48
    • 64

    Rain Showers Likely

    • 48
    • 65

    Chance Rain Showers

    • 52
    • 69

    Partly Sunny

    • 52
    • 64

    Slight Chance Rain

    • 52
    • 67

    Partly Sunny

    • 54
    • 74

    Mostly Sunny

Today 4 Sep Foothills and Valleys of Pierce and Southern King Counties

Partly sunny. A slight chance of Thunderstorms early in the afternoon. A chance of Showers and a slight chance of Thunderstorms late in the afternoon. Highs near 70. Light wind.

Tonight 4 Sep Foothills and Valleys of Pierce and Southern King Counties

Mostly cloudy. A slight chance of rain in the evening. Lows in the mid 40s to lower 50s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Howard A Hanson Reservoir Temperature Statistics

September Temperature

Seattle, Seattle-Tacoma International Airport (28 miles)

  • Lowest 1 September, 2026

    57 °F

  • Average September

    61.2 °F

  • Highest 1 September, 2026

    66 °F

Climate (2021–2026)

Seattle, Seattle-Tacoma International Airport (28 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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