Summit Lake Weather Forecast

    • 51
    • 72

    Becoming Sunny

    • 53
    • 85

    Sunny

    • 51
    • 77

    Mostly Sunny

    • 51
    • 75

    Mostly Sunny

    • 53
    • 78

    Partly Sunny

    • 53
    • 76

    Chance Rain

Today 15 Sep Willapa and Black Hills

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

Tonight 15 Sep Willapa and Black Hills

Mostly clear. Lows in the upper 40s to mid 50s. Northeast wind to 10 Mph becoming east with Gusts to 25 Mph after midnight.

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Summit Lake Temperature Statistics

September Temperature

Olympia, Olympia Airport (10.6 miles)

  • Lowest 8 September, 2025

    48 °F

  • Average September

    63.2 °F

  • Highest 3 September, 2025

    84.9 °F

Climate (2020–Present)

Olympia, Olympia Airport (10.6 miles)

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  • Average Low 2020–2025

    41.7 °F

  • Average 2020–2025

    51.6 °F

  • Average High 2020–2025

    62.1 °F
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