Castle Lake Weather Forecast

    • 62
    • 86

    Sunny

    • 64
    • 87

    Mostly Sunny

    • 56
    • 84

    Mostly Sunny

    • 51
    • 69

    Partly Sunny

    • 50
    • 64

    Mostly Cloudy

    • 51
    • 64

    Partly Sunny

Today 10 Aug South Washington Cascades

Sunny. Free air freezing level above 16000 feet. Winds light.

Tonight 10 Aug South Washington Cascades

Clear. Free air freezing level above 16000 feet. North wind 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Lake Temperature Statistics

August Temperature

Southwest Washington Regional Airport (30.4 miles)

  • Lowest 8 August, 2025

    50 °F

  • Average August

    65.2 °F

  • Highest 1 August, 2025

    82 °F

Climate (2020–Present)

Southwest Washington Regional Airport (30.4 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.2 °F
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