Lake Merwin Weather Forecast

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    Rain

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    • 49

    Rain

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    • 56

    Chance Rain

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    • 49

    Rain

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    Chance Rain

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    Partly Sunny

Today 29 Jan South Washington Cascade Foothills

Rain. Highs in the lower 50s. Southeast wind 10 to 15 Mph. Chance of rain near 100 percent. Rainfall Amounts a tenth to a half of an inch.

Tonight 29 Jan South Washington Cascade Foothills

Cloudy with a 50 percent chance of rain. Lows in the mid 40s. Southeast wind 5 to 10 Mph. Rainfall Amounts less than a tenth of an inch.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Merwin Temperature Statistics

January Temperature

Southwest Washington Regional Airport (22.4 miles)

  • Lowest 25 January, 2026

    19 °F

  • Average January

    40.3 °F

  • Highest 15 January, 2026

    55.9 °F

Climate (2021–Present)

Southwest Washington Regional Airport (22.4 miles)

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  • Average Low 2021–2026

    45.1 °F

  • Average 2021–2026

    52.9 °F

  • Average High 2021–2026

    62.4 °F
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