Summit Lake Weather Forecast

    • 43
    • 58

    Rain

    • 39
    • 54

    Rain

    • 39
    • 47

    Rain

    • 37
    • 48

    Rain

    • 35
    • 45

    Rain

    • 35
    • 44

    Rain

Today 15 Dec Willapa and Black Hills

Windy. A slight chance of Thunderstorms in the morning. Showers through the day. A slight chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the afternoon. Rainfall Amounts one to three Inches Possible, except higher Amounts possible in Thunderstorms. Highs in the mid 50s to lower 60s. South wind 15 to 30 Mph becoming southwest in the afternoon. Gusts to 45 Mph.

Tonight 15 Dec Willapa and Black Hills

Windy. Showers and a slight chance of Thunderstorms in the Evening, then rain at Times after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Lows in the lower to mid 40s. Southwest wind 15 to 30 Mph becoming south 10 to 15 Mph after Midnight, Gusts to 40 Mph decreasing to 25 Mph after midnight.

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Summit Lake Temperature Statistics

December Temperature

Olympia, Olympia Airport (10.6 miles)

  • Lowest 1 December, 2025

    30.9 °F

  • Average December

    47.7 °F

  • Highest 12 December, 2025

    59 °F

Climate (2020–Present)

Olympia, Olympia Airport (10.6 miles)

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  • Average Low 2020–2025

    41.8 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    62.1 °F
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