Castle Rock Weather Forecast

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    Rain

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    Rain

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    Rain Likely

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    Rain

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    Rain Likely

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    Slight Chance Rain/Snow

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    Chance Rain

Today 22 Dec Cowlitz County Lowlands

Partly sunny with a chance of rain this Morning, then rain this afternoon. Highs in the upper 40s. South wind 10 to 15 Mph. Chance of rain near 100 percent. Rainfall Amounts a tenth to a quarter of an inch.

Tonight 22 Dec Cowlitz County Lowlands

Mostly cloudy. A chance of Rain, mainly this evening. Lows in the upper 30s. South wind 5 to 10 Mph. Chance of rain 50 percent. Rainfall Amounts a tenth to a quarter of an inch.

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Castle Rock Temperature Statistics

December Temperature

Southwest Washington Regional Airport (10.6 miles)

  • Lowest 1 December, 2025

    35.1 °F

  • Average December

    48.8 °F

  • Highest 15 December, 2025

    60.1 °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

    53 °F

  • Average High 2020–2025

    62.4 °F
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