Castle Lake Weather Forecast

    • 34
    • 46

    Mostly Sunny

    • 34
    • 47

    Mostly Cloudy

    • 36
    • 43

    Rain

    • 35
    • 43

    Rain/Snow

    • 34
    • 40

    Rain/Snow

    • 34
    • 40

    Rain/Snow

Today 30 Dec South Washington Cascades

Sunny. Free air freezing level 9000 Feet, increasing to free air freezing level 11000 feet in the afternoon. East wind 15 to 20 Mph. Gusts up to 45 Mph, decreasing to 35 Mph in the afternoon.

Tonight 30 Dec South Washington Cascades

Mostly clear in the Evening, then becoming partly cloudy. Widespread frost. Free air freezing level 10000 Feet, decreasing to free air freezing level 9000 feet after midnight. East wind 10 to 15 Mph.

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Castle Lake Temperature Statistics

December Temperature

Southwest Washington Regional Airport (30.4 miles)

  • Lowest 1 December, 2025

    35.1 °F

  • Average December

    47.2 °F

  • Highest 15 December, 2025

    60.1 °F

Climate (2020–Present)

Southwest Washington Regional Airport (30.4 miles)

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  • Average Low 2020–2025

    45.2 °F

  • Average 2020–2025

    53 °F

  • Average High 2020–2025

    62.4 °F
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