Lake Merwin Weather Forecast

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    • 42

    Rain

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    • 44

    Rain

    • 30
    • 36

    Rain/Snow

    • 29
    • 35

    Rain/Snow

    • 25
    • 34

    Rain/Snow

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    Rain/Snow Likely

Today 30 Jan South Washington Cascade Foothills

Widespread frost in the morning. Partly sunny in the Morning, then mostly cloudy with a slight chance of rain in the afternoon. Snow level 2000 feet. Highs in the mid 40s. Winds light. Chance of rain 20 percent.

Tonight 30 Jan South Washington Cascade Foothills

Rain. Lows in the upper 30s. Southeast wind 10 to 15 Mph. Chance of rain near 100 percent. Rainfall Amounts a half of an inch to one inch.

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Lake Merwin Temperature Statistics

January Temperature

Southwest Washington Regional Airport (22.4 miles)

  • Lowest 26 January, 2025

    19.9 °F

  • Average January

    38.4 °F

  • Highest 8 January, 2025

    54 °F

Climate (2020–Present)

Southwest Washington Regional Airport (22.4 miles)

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  • Average Low 2020–2025

    44.9 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    62.1 °F
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