Castle Rock Weather Forecast

    • 53
    • 89

    Sunny

    • 53
    • 79

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 52
    • 78

    Partly Sunny

    • 57
    • 71

    Chance Rain Showers

    • 51
    • 71

    Chance Rain Showers

    • 52
    • 72

    Partly Sunny

Today 16 Sep Cowlitz County Lowlands

Sunny. Highs in the upper 80s. East wind 5 to 10 Mph, becoming southeast this afternoon.

Tonight 16 Sep Cowlitz County Lowlands

Clear. Lows in the mid 50s. Southwest wind 5 to 10 Mph.

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Castle Rock Temperature Statistics

September Temperature

Southwest Washington Regional Airport (10.6 miles)

  • Lowest 14 September, 2025

    51.1 °F

  • Average September

    65.6 °F

  • Highest 2 September, 2025

    88 °F

Climate (2020–Present)

Southwest Washington Regional Airport (10.6 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.3 °F
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